30 Be tender, I beseech you, of this body, and understand that you will be raised from the dead, to be judged with this body. But if there steal into your mind any thought of unbelief, as though the thing were impossible, judge of the things unseen by what happens to yourself. For tell me; a hundred years ago or more, think where wast you yourself: and from what a most minute and mean substance you have come to so great a stature, and so much dignity of beauty. What then? Cannot He who brought the non-existent into being, raise up again that which already exists and has decayed? He who raises the grain, which is sown for our sakes, as year by year it dies—will He have difficulty in raising us up, for whose sakes that grain also has been raised? Do you see how the trees stand now for many months without either fruit or leaves: but when the winter is past they spring up whole into life again as if from the dead: shall not we much rather and more easily return to life? The rod of Moses was transformed by the will of God into the unfamiliar nature of a serpent: and cannot a man, who has fallen into death, be restored to himself again?
Source: Catechetical Lectures (New Advent)