Genesis 27 is a strange story. Isaac knew that Esau had sold his birthright to Jacob, but when he was close to death he intends to bless Esau rather than Jacob. Gen 25v28 tells us that Isaac favoured Esau because of his venison, and Isaac requests a meal of venison before he dies.
Jacob and Rebekah conspire to deceive Isaac into giving Jacob the blessing of the birthright. When Isaac realises the deception, he “trembled very greatly”. He knew that the blessing of the birthright should have gone to Jacob, and God had prevented him from blessing Esau instead. God’s intended plan cannot be hindered by man.
David writes in Psalm 32 of the forgiveness of God, and also of trusting in God. “Many are the sorrows of the wicked, but steadfast love surrounds the one who trusts in the LORD”. What God has promised will certainly occur, and we can be absolutely confident in God’s word, His love, and our glorious future together with Him.