Also from Eliot's Choruses

О Lord, deliver me from the man of excellent intention and
  impure heart: for the heart is deceitful above all things, and
  desperately wicked.

Sanballat the Horonite and Tobiah the Ammonite and Geshem
  the Arabian: were doubtless men of public spirit and zeal.

Preserve me from the enemy who has something to gain: and
  from the friend who has something to lose.

Remembering the words of Nehemiah the Prophet: "The trowel
  in hand, and the gun rather loose in the holster."