Answer:
I can run but not walk. Wherever I go, thought follows close behind.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
What can be seen but never found that only hides in the unwound?
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
What covers its face with its hands, speaks no language, yet most known what it's saying?