Psalms 51: 3 - 7, 10 - 11
3 For I know my transgressions, and my sin is ever before me.
4 Against thee, thee only, have I sinned, and done that which is evil in thy sight, so that thou art justified in thy sentence and blameless in thy judgment.
5 Behold, I was brought forth in iniquity, and in sin did my mother conceive me.
6 Behold, thou desirest truth in the inward being; therefore teach me wisdom in my secret heart.
7 Purge me with hyssop, and I shall be clean; wash me, and I shall be whiter than snow.
10 Create in me a clean heart, O God, and put a new and right spirit within me.
11 Cast me not away from thy presence, and take not thy holy Spirit from me.

EWTN