Up to this point in Abraham's story we have seen him time and time again try to provide for himself in difficult times. Whether it be going to Egypt, offering his wife to pharaoh, having a child with Hagar, or many other examples, Abraham has a pattern of abandoning God's provision for his own efforts when times get tough. So why would he fully obey the most difficult test God could have given him? Maybe Abraham has finally learned the lesson God has been teaching him his whole life.