Madison Julius Cawein - Conscience

Within the soul are throned two powers,
One, Love; one, Hate. Begot of these,
And veiled between, a presence towers,
The shadowy keeper of the keys.

With wild command or calm persuasion
This one may argue, that compel;
Vain are concealment and evasion
For each he opens heaven and hell.

Madison Julius Cawein

http://www.poemhunter.com/poem/conscience-16/