13. We have within ourselves, in our own experience and feelings, a knowledge of how greatly our frail and fallen nature is inclined to evil. Today we go and confess certain of our faults, making the resolution not to fall into them again, and tomorrow notwithstanding we commit them once more.

At one moment we make up our minds to acquire a certain virtue, and the next we do just the contrary by falling into the opposite vice. At the time when we make these resolutions of amendment we imagine that our will is firm and strong, but we soon perceive how weak and unreliable it is, for we behave as though we had never purposed amendment at all.

Our heart is like a reed that bends before every wind, or a barque tossed by every wave. It is sufficient to meet with an occasion of sin, a movement of passion, a breath of temptation, for the will to yield to evil even when in certain moments of fervor we seem most firmly rooted in good. This is a strong reason for us to be humble and not to presume anything of ourselves, praying to God continually that He may deign to confirm in our hearts that which He works through His grace. 

"Confirm, O God, what Thou hast wrought in us." [Ps. lxvii, 29]