Sin is believing the lie that you are self-created, self-dependent and self-sustained.
Saint AugustineConsequently, heretics and schismatics, separated from the unity of this Body, are able to receive the same Sacrament, but with no benefit to themselves; indeed, more to their own harm, in that they are judged the more severely rather than being liberated.
Saint AugustineO Sacrament of Love! O sign of Unity! O bond of Charity! He who would have Life finds here indeed a Life to live in and a Life to live by.
Saint AugustineFor 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.
Saint Augustine