If, therefore, we are taught, and if we believe, that we ought not to know the necessary prescience of God, and the necessity of the things that are to take place, Christian faith is utterly destroyed, and the promises of God and the whole Gospel entirely fall to the ground; for the greatest and only consolation of Christians in their adversities, is the knowing that God lies not, but does all things immutably, and that His will cannot be resisted, changed, or hindered. --Martin Luther
This mystery of his will God discovered to but a small number under the Old Testament; under the New, (the distinction between various peoples having been removed), he reveals himself to many, without any distinction of people. The cause of this dispensation is not to be ascribed to the superior worth of one nation above another, nor to their making a better use of the light of nature, but results wholly from the sovereign good pleasure and unmerited love of God. Hence they, to whom so great and so gracious a blessing is communicated, above their desert, or rather notwithstanding their demerits, are bound to acknowledge it with humble and grateful hearts, and with the apostle to adore, not curiously to pry into the severity and justice of God's judgments displayed to others, to whom this grace is not given. Canons of Dordt, 3rd & 4th Heads of Doctrine, Article Seven
Article XVII
Of Predestination and Election
Predestination to life is the everlasting purpose of God, whereby, before the foundations of the world were laid, He hath constantly decreed by His counsel secret to us, to deliver from curse and damnation those whom He hath chosen in Christ out of mankind, and to bring them by Christ to everlasting salvation as vessels made to honour. Wherefore they which be endued with so excellent a benefit of God be called according to God's purpose by His Spirit working in due season; they through grace obey the calling; they be justified freely; they be made sons of God by adoption; they be made like the image of His only-begotten Son Jesus Christ; they walk religiously in good works; and at length by God's mercy they attain to everlasting felicity.
As the godly consideration of Predestination and our Election in Christ is full of sweet, pleasant, and unspeakable comfort to godly persons and such as feel in themselves the working of the Spirit of Christ, mortifying the works of the flesh and their earthly members and drawing up their mind to high and heavenly things, as well because it doth greatly establish and confirm their faith of eternal salvation to be enjoyed through Christ, as because it doth fervently kindle their love towards God: so for curious and carnal persons, lacking the Spirit of Christ, to have continually before their eyes the sentence of God's Predestination is a most dangerous downfall, whereby the devil doth thrust them either into desperation or into wretchlessness of most unclean living no less perilous than desperation.
Furthermore, we must receive God's promises in such wise as they be generally set forth in Holy Scripture; and in our doings that will of God is to be followed which we have expressly declared unto us in the word of God.
so for curious and carnal persons, lacking the Spirit of Christ, to have continually before their eyes the sentence of God's Predestination is a most dangerous downfall, whereby the devil doth thrust them either into desperation or into wretchlessness of most unclean living no less perilous than desperation.
and "A stone of stumbling, and a rock of offense." They stumble because they disobey the word, as they were destined to do. (1 Peter 2:8 ESV)
What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, (Romans 9:22 ESV)
For certain people have crept in unnoticed who long ago were designated for this condemnation, ungodly people, who pervert the grace of our God into sensuality and deny our only Master and Lord, Jesus Christ. (Jude 1:4 ESV)
though they were not yet born and had done nothing either good or bad--in order that God's purpose of election might continue, not because of works but because of him who calls-- 12 she was told, "The older will serve the younger." 13 As it is written, "Jacob I loved, but Esau I hated." (Romans 9:11-13 ESV)
As it is written, "Jacob I loved, but Esau I hated." 14 What shall we say then? Is there injustice on God's part? By no means! 15 For he says to Moses, "I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion." 16 So then it depends not on human will or exertion, but on God, who has mercy. 17 For the Scripture says to Pharaoh, "For this very purpose I have raised you up, that I might show my power in you, and that my name might be proclaimed in all the earth." 18 So then he has mercy on whomever he wills, and he hardens whomever he wills. 19 You will say to me then, "Why does he still find fault? For who can resist his will?" 20 But who are you, O man, to answer back to God? Will what is molded say to its molder, "Why have you made me like this?" 21 Has the potter no right over the clay, to make out of the same lump one vessel for honorable use and another for dishonorable use? 22 What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, 23 in order to make known the riches of his glory for vessels of mercy, which he has prepared beforehand for glory-- (Romans 9:13-23 ESV)
Sect. 9.—THIS, therefore, is also essentially necessary and wholesome for Christians to know: That God foreknows nothing by contingency, but that He foresees, purposes, and does all things according to His immutable, eternal, and infallible will. By this thunderbolt, "Free-will" is thrown prostrate, and utterly dashed to pieces. Those, therefore, who would assert "Free-will," must either deny this thunderbolt, or pretend not to see it, or push it from them. . . .
. . . You openly declare that the immutable will of God is to be known, but you forbid the knowledge of His immutable prescience. Do you believe that He foreknows against His will, or that He wills in ignorance? If then, He foreknows, willing, His will is eternal and immovable, because His nature is so: and, if He wills, foreknowing, His knowledge is eternal and immovable, because His nature is so.
From which it follows unalterably, that all things which we do, although they may appear to us to be done mutably and contingently, and even may be done thus contingently by us, are yet, in reality, done necessarily and immutably, with respect to the will of God. For the will of God is effective and cannot be hindered; because the very power of God is natural to Him, and His wisdom is such that He cannot be deceived. And as His will cannot be hindered, the work itself cannot be hindered from being done in the place, at the time, in the measure, and by whom He foresees and wills. If the will of God were such, that, when the work was done, the work remained but the will ceased, (as is the case with the will of men, which, when the house is built which they wished to build, ceases to will, as though it ended by death) then, indeed, it might be said, that things are done by contingency and mutability. But here, the case is the contrary; the work ceases, and the will remains. [From: The Bondage of the Will: The Sovereignty of God.
Wherefore, their ridiculous play upon words, that all things take place from the necessity of the consequence, but not from the necessity of the thing consequent, amounts to nothing more than this—all things take place of necessity, but all the things that do take place are not God Himself. But what need was there to tell us this? As though there were any fear of our asserting, that the things done were God Himself, or possessed divine or necessary nature. This asserted truth, therefore, stands and remains invincible—that all things take place according to the immutable will of God! which they call the necessity of the consequence. Nor is there here any obscurity or ambiguity. In Isaiah he saith, "My counsel shall stand, and My will shall be done." (Isaiah 46:10) And what schoolboy does not understand the meaning of these expressions, "Counsel," "will," "shall be done," "shall stand?" (Ibid.)
And how can you be certain and secure, unless you are persuaded that He knows and wills certainly, infallibly, immutably, and necessarily, and will perform what He promises? Nor ought we to be certain only that God wills necessarily and immutably, and will perform, but also to glory in the same; as Paul, (Romans 3:4) "Let God be true, but every man a liar." And again, "For the word of God is not without effect." (Romans 9:6) And in another place, "The foundation of God standeth sure, having this seal, the Lord knoweth them that are His." (2 Timothy 2:19) And, "Which God, that cannot lie, promised before the world began." (Titus 1:2) And, "He that cometh, must believe that God is, and that He is a rewarder of them that hope in Him." (Hebrews 11:6)
If, therefore, we are taught, and if we believe, that we ought not to know the necessary prescience of God, and the necessity of the things that are to take place, Christian faith is utterly destroyed, and the promises of God and the whole Gospel entirely fall to the ground; for the greatest and only consolation of Christians in their adversities, is the knowing that God lies not, but does all things immutably, and that His will cannot be resisted, changed, or hindered. (Ibid.)
For Christ did not send me to baptize but to preach the gospel, and not with words of eloquent wisdom, lest the cross of Christ be emptied of its power. 18 For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God. 19 For it is written, "I will destroy the wisdom of the wise, and the discernment of the discerning I will thwart." 20 Where is the one who is wise? Where is the scribe? Where is the debater of this age? Has not God made foolish the wisdom of the world? 21 For since, in the wisdom of God, the world did not know God through wisdom, it pleased God through the folly of what we preach to save those who believe. 22 For Jews demand signs and Greeks seek wisdom, 23 but we preach Christ crucified, a stumbling block to Jews and folly to Gentiles, 24 but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God. 25 For the foolishness of God is wiser than men, and the weakness of God is stronger than men. (1 Corinthians 1:17-25 ESV)
Predestination to life is the everlasting purpose of God, whereby, before the foundations of the world were laid, He hath constantly decreed by His counsel secret to us, to deliver from curse and damnation those whom He hath chosen in Christ out of mankind, and to bring them by Christ to everlasting salvation as vessels made to honour. (See Romans 9:21-23) Article 17
(See also, Double or Nothing: Luther's Doctrine of Predestination.