"And these are the generations of Isaac the son of Abraham, Abraham begat Isaac." Know who your father really is; he can make you potent.
Isaac and Rebecca had two sons, Jacob and Esau, one righteous and one wicked. Isaac and Rebecca are in our mind, Jacob and Esau in our heart.
Jacob and Esau are the two inclinations in our hearts, the good inclination and the evil inclination.
What is an inclination? A little guy that whispers to you, "Hey, you know what's really fun…."
Most of us can never throw out our evil inclination. You have to learn how to live with it, try to suppress it, and hope for the best.
But why did God give us an evil inclination? A good question. Maybe in order to use its particular type of "fun consciousness" to serve God.
God wants us to fear Him, to accept the yoke of Heaven (to serve Him by performing His commandments) and to have fun simultaneously.
While Jacob was busy studying Torah, Esau had fun hunting in the fields. Isaac elevated Esau's fun by enjoying the meat he brought him.
Isaac never gave up on Esau. He loved him and invested in him tremendous spiritual energy. Isaac has yet to succeed.