Parashat Vayeira recounts the tenth and last trial of Avraham: “The Binding of Yitzchak.” Avraham is commanded to sacrifice his beloved son, his long-awaited heir. Avraham does not complain, nor does he engage God in dialogue. He does not negotiate, as he had on other occasions. It seems that Avraham senses that this is something he must do. We, on the other hand, are faced with an obvious question: What is the purpose of this test?