Live thy Life,
Young and old,
Like yon oak,
Bright in spring,
Living gold;
Summer-rich
Then; and then
Autumn-changed
Soberer-hued
Gold again.
All his leaves
Fall'n at length,
Look, he stands,
Trunk and bough
Naked strength.
Alfred Lord Tennyson
http://www.poemhunter.com/poem/the-oak-2/