Robert Crawford - Self-Harmony.

Ourselves within ourselves, we then are free
To touch the world at every turn, and take
The moods of men and mingle them with ours;
But ourselves out of ourselves, we are slaved
To every passing rumour, loose our hold,
And slipping in the flood of circumstance
Are whirled away.

Robert Crawford

http://www.poemhunter.com/poem/self-harmony/