We read in those holy books: “And God tempted Abraham, and said unto him, Abraham, Abraham, where art thou? And he said, Here am I.” Thou to whom my speech is addressed, was such the case with thee? When afar off thou didst see the heavy dispensation of providence approaching thee, didst thou not say to the mountains, Fall on me, and to the hills, Cover me? Or if thou wast stronger, did not thy foot move slowly along the way, longing as it were for the old path? When a call was issued to thee, didst thou answer, or didst thou not answer perhaps in a low voice, whisperingly? Not so Abraham: joyfully, buoyantly, confidently, with a loud voice, he answered, “Here am I.” We read further: “And Abraham rose early in the morning” — as though it were to a festival, so he hastened, and early in the morning he had come to the place spoken of, to Mount Moriah. He said nothing to Sarah, nothing to Eleazar. Indeed who could understand him? Had not the temptation by its very nature exacted of him an oath of silence? He cleft the wood, he bound Isaac, he lit the pyre, he drew the knife. My hearer, there was many a father who believed that with his son he lost everything that was dearest to him in the world, that he was deprived of every hope for the future, but yet there was none that was the child of promise in the sense that Isaac was for Abraham. There was many a father who lost his child; but then it was God, it was the unalterable, the unsearchable will of the Almighty, it was His hand took the child. Not so with Abraham. For him was reserved a harder trial, and Isaac’s fate was laid along with the knife in Abraham’s hand. And there he stood, the old man, with his only hope! But he did not doubt, he did not look anxiously to the right or to the left, he did not challenge heaven with his prayers. He knew that it was God the Almighty who was trying him, he knew that it was the hardest sacrifice that could be required of him; but he knew also that no sacrifice was too hard when God required it — and he drew the knife.
Kierkegaard, Fear and Trembling