Psalm 51: Create within me a pure heart

You desire my inner truth... cause me to know inner wisdom.
  Purge me with hyssop and I will be clear. Wash me, and I’ll be whiter than snow.
      Create within me a pure heart, renew within me a steadfast spirit.

Don't cast me away, or leave me. Let me know the joy of Your Presence.
   Open, I ask You, my lips, and my mouth shall declare Your praise.