Let go of your worries
and be completely clear-hearted,
like the face of a mirror
that contains no images.
If you want a clear mirror,
behold yourself
and see the shameless truth,
which the mirror reflects.
If metal can be polished
to a mirror-like finish,
what polishing might the mirror
of the heart require?
Between the mirror and the heart
is this single difference:
the heart conceals secrets,
while the mirror does not.

Mewlana Jalaluddin Rumi

http://www.poemhunter.com/poem/let-go-of-your-worries/