I often see a single part of this quote, but the whole is really much better.
"All that is gold does not glitter
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
From the ashes, a fire shall be woken,
A light from the shadows shall spring;
Renewed shall be blade that was broken,
The crownless again shall be king."
J.R.R Tolkien
I know this is actually a poem, and not necessarily a quote, but the second line is oft quoted. The first 4 lines really tie the room together though