I have ever found myself to be my greatest enemy. I never had a foe that troubled me so much as my own heart; nor has any one ever wrought me half the mischief or given me half the plague that I have felt and known within.  And it is a daily sense of this which makes me dread myself more than anybody that walks upon the face of the earth!

Keep a watchful eye upon every inward foe; and if you fight, fight against the enemy that lurks and works in your own breast!

- J.C. Philpot (1859)