Because that Abraham obeyed My Voice and kept My Charge - Genesis 26:5
It is awful to realize how our sins may repeat themselves in our children. Here is Isaac following in the precise steps of Abraham, who had acted in a similar manner toward Sarah when entering Egypt. In each case there was a sad lapse of faith; but it was even worse for Isaac, with Abraham's example to warn him. But a man may pass blessings on to his children, as well as the sad entail of evil habits.
He leaves the blessing of the divine covenant. God had entered into covenant with Abraham, and was prepared to fulfill its provisions to his son. "I will be a God to thee, and to thy seed after thee." So a godly ancestor may be able to secure for all his seed a share in the divine grace and favor. The spirit that is put on him does not depart from his seed, or his seed's seed forever.
The blessing of his prayer. - It is impossible to over-estimate the effect of a good man's prayers; they are as streams or trees, which go on flowing and bearing fruit long after they were originated. The legacy of a good man's prayers is of priceless worth. He may have long since passed to his rest; but God remembers them, and answers them in blessings to the next generation. How often in this chapter we read that "God blessed Isaac."
The blessing of a noble name. - We may all leave that, if we can transmit nothing else. To have had a father that knew God, walked with God, pleased God; who was on intimate terms with Him, and could speak to Him, as a man with his friend - illumined the ordinary nature and existence of Isaac with unearthly beauty. Let us live so that our children may be ranked as nobles, because they bear our name.