Soren Kierkegaard was a Danish philosopher, theologian, and religious author interested in human psychology. He is regarded as a leading pioneer of existentialism and one of the greatest philosophers of the 19th Century.
In Fear and Trembling, Kierkegaard wanted to understand the anxiety that must have been present in Abraham when God commanded him to offer his son as a human sacrifice. Abraham had a choice to complete the task or to forget it. He resigned himself to the loss of his son, acting according to his faith. In other words, one must be willing to give up all his or her earthly possessions in infinite resignation and must also be willing to give up whatever it is that he or she loves more than God. Abraham had passed the test -- his love for God proved greater than anything else in him. And because a good and just Creator would not want a father to kill his son, God intervened at the last moment to prevent the sacrifice.