"For I wondered that others, subject to death, did live, since he whom I loved, as if he should never die, was dead; and I wondered yet more that myself, who was to him a second self, could live, he being dead. Well said one of his friend, "Thou half of my soul"; for I felt that my soul and his soul were "one soul in two bodies": and therefore was my life a horror to me, because I would not live halved. And therefore perchance I feared to die, lest he whom I had much loved should die wholly."

Source: Saint Augustine, Bishop of Hippo, Saint Augustine of Hippo (2006). “The Confessions of Saint Augustine”, p.53, 1st World Publishing