Not too little, not too great

Hence it is necessary that Christians contend on both sides against the devil and their own flesh. For when they begin to repent and would gladly become different people, then they first feel the devil's influence, how he excites, hinders and controls them, so that they make no progress, but remain in their old state, etc. Again, if they cannot prevent this, and in spite of the devil turn to God and call upon him, he will attack them with weak courage and cowardice. First, he makes sin so very small, and puts them so far beyond the reach of the eyes and hearts of men, that men may despise them and not desire grace, or they put off repentance. Then on the contrary, he makes sin really too great, as he can blow a fire from a spark greater than heaven and earth, so that it will again be difficult to lay hold of forgiveness, or to bring into his heart the words: "God be thou merciful to me!" Thus indeed it is and will continue to be a great art, and we may well take this publican as our example, our teacher and doctor, and learn of him, and call upon God that we may also obtain the end of our faith.

Martin Luther, The Publican & The Pharisee

Amen. All that is left is for me to say, "God be merciful to me, a sinner".