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... rather let me know the joy of Your Presence.
   Open, I ask You, my lips... and my mouth shall declare Your praise.