“God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden.” [Romans 9:18]

“The doctrine of the sovereignty of God will guard those who seek salvation from two opposite extremes-presumption and discouragement.”

Do not presume upon the mercy of God, and so encourage yourself in sin. Many hear that God’s mercy is infinite, and therefore think, that if they delay seeking salvation for the present, and seek it later in life, that God will bestow His grace upon them. But consider, that though God’s grace is sufficient, yet He is sovereign, and will use His own pleasure to determine whether He will save you or not. If you put off salvation till the end of your life, salvation will not be in your power. It will be as a sovereign God pleases, whether you shall obtain it or not. Therefore, seeing that in this matter you are so absolutely dependent on God, it is best to follow His direction in seeking it, which is to listen to His voice, which says, “Today, if you hear My voice, do not harden your hearts” [Psalm 95:7-8].

Beware also of discouragement. Take heed of despairing thoughts, because you are a great sinner, because you have persevered so long in sin, have backslidden, and resisted the Holy Spirit. Remember that, no matter what your case may be, no matter how great a sinner you are, God can bestow mercy upon you without the least prejudice to the honor of His holiness, which you have offended, or to the honor of His majesty, which you have insulted, or of His justice, which you have made your enemy, or of His truth, or of any of His attributes. Let you be what sinner you may, God can, if He pleases, greatly glorify Himself in your salvation. Amen.

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The above quote from Jonathan Edwards is part of a larger manuscript that can be found and read here.