The poem, even a short time after being written,
seems no miracle; unwritten, it seems
something beyond the capacity of the gods.

*

Art is the means we have of undoing the damage of
haste. It's what everything else isn't.

*

You can't make poetry simply by avoiding clichés.

*

There's a point where plainness is no longer a virtue,
when it becomes excessively bald, wrenched.

*

You must believe: a poem is a holy thing -- a good poem,
that is.

Theodore Roethke

http://www.poemhunter.com/poem/various-quotes-from-on-poetry-and-craft-selected/