Celsus has not explained how error accompanies the “becoming,” or product of generation; nor has he expressed himself with sufficient clearness to enable us to compare his ideas with ours, and to pass judgment on them. But the prophets, who have given some wise suggestions on the subject of things produced by generation, tell us that a sacrifice for sin was offered even for new-born infants, as not being free from sin. They say, “I was shapen in iniquity, and in sin did my mother conceive me;” also, “They are estranged from the womb;” which is followed by the singular expression, “They go astray as soon as they are born, speaking lies.” Besides, our wise men have such a contempt for all sensible objects, that sometimes they speak of all material things as vanity: thus, “For the creature was made subject to vanity, not willingly, but by reason of him that subjected the same in hope;” at other times as vanity of vanities, “Vanity of vanities, says the Preacher, all is vanity.” Who has given so severe an estimate of the life of the human soul here on earth, as he who says: “Verily every man at his best estate is altogether vanity?” He does not hesitate at all as to the difference between the present life of the soul and that which it is to lead hereafter. He does not say, “Who knows if to die is not to live, and if to live is not death” But he boldly proclaims the truth, and says, “Our soul is bowed down to the dust;” and, “You have brought me into the dust of death;” and similarly, “Who will deliver me from the body of this death?” also, “Who will change the body of our humiliation.” It is a prophet also who says, “You have brought us down in a place of affliction;” meaning by the “place of affliction” this earthly region, to which Adam, that is to say, man, came after he was driven out of paradise for sin. Observe also how well the different life of the soul here and hereafter has been recognised by him who says, “Now we see in a glass, obscurely, but then face to face;” and, “Whilst we are in our home in the body, we are away from our home in the Lord;” wherefore “we are well content to go from our home in the body, and to come to our home with the Lord.”
Source: Against Celsus (New Advent)