Isaac pleaded with the Lord on behalf of his wife Rebekah, who was barren. For twenty years they were unable to have children.
God did not withhold from them the joy of children because he wanted to make their lives miserable. We are not sure why twenty years passed before Rebekah became pregnant with twins.
But surely God was pleased with Isaac when he pleaded with him — as He was pleased with Abraham when he pleaded for the safety of his nephew in Sodom, or Job when he wrestled with God over his circumstances.
