2 Corinthians 4:13
2 “But having the same spirit of faith, according to that which is written, I believed, and therefore did I speak; we also believe, and therefore also we speak; that He which raised up the Lord Jesus, shall raise up us also by Jesus.”
He has reminded us of a Psalm which abounds in heavenly wisdom, and is especially fitted to encourage in dangers. For this saying that just man uttered when he was in great dangers, and from which there was no other possibility of recovery than by the aid of God. Since then kindred circumstances are most effective in comforting, therefore he says, “having the same Spirit;” that is, 'by the same succor by which he was saved, we also are saved; by the Spirit through which he spoke, we also speak.' Whence he shows, that between the New and Old Covenants great harmony exists, and that the same Spirit wrought in either; and that not we alone are in dangers, but all those of old were so too; and that we must find a remedy through faith and hope, and not seek at once to be released from what is laid upon us. For having showed by arguments the resurrection and the life, and that the danger was not a mark of helplessness or destitution; he thenceforward brings in faith also, and to it commits the whole. But still of this also, he furnishes a proof, the resurrection, namely, of Christ, saying, “we also believe, and therefore also we speak.” What do we believe? Tell me.
Source: Homilies on Second Corinthians (New Advent)