Brother Lawerence on sin and grace:

"That when he had failed in his duty, he only confessed his fault, saying to GOD, I shall never do otherwise, if You leave me to myself; ’tis You must hinder my falling, and mend what is amiss. That after this, he gave himself no further uneasiness about it...

"That he was very sensible of his faults, but not discouraged by them; that he confessed them to GOD, and did not plead against Him to excuse them. When he had so done, he peaceably resumed his usual practice of love and adoration...

"That we ought, without anxiety, to expect the pardon of our sins from the Blood of JESUS CHRIST, only endeavouring to love Him with all our hearts. That GOD seemed to have granted the greatest favours to the greatest sinners, as more signal monuments of His mercy...

- Brother Lawrence's book, 'The Practice of the Presence of God,' is a wonderful encouragement, and an easy and short read: http://www.ccel.org/ccel/lawrence/practice.ii.html