The presumptuous man is convinced he has acquired a distrust of himself and confidence in God, but his mistake is never more apparent than when some fault is committed. For, if he yields to anger and despairs of advancing in the way of virtue, it is evident that he placed his confidence in himself and not in God. The greater the anxiety and despondence, the greater is the certainty of his guilt.

The man who has deep distrust of himself and places great confidence in God is not at all surprised if he commits a fault. He does not abandon himself to confused despair; he correctly attributes what has happened to his own weakness and lack of confidence in God. Thus he learns to distrust himself more, and he places all his hopes in the assistance of the Almighty. He detests beyond all things the sin into which he has fallen; he condemns the passion or criminal habit that occasioned his fall; he conceives a deep sorrow for his offense against God. But his sorrow, accompanied by peace of mind, does not interrupt the method he has laid down, nor does it prevent the pursuit of his enemies to their final destruction.  –Dom Lorenzo Scupoli ‘The Spiritual Combat’