Who does his task from day to day
And meets whatever comes his way,
Believing God has willed it so.
Has found real greatness here below.

Who guards his post, no matter where,
Believing god must need him there,
Although but lowly toil it be,
Has risen to nobility.

For great and low there's but one test:
`Tis that each man shall do his best.
Who works with all the strength he can
Shall never die in debt to man.

Edgar Albert Guest

http://www.poemhunter.com/poem/true-nobility/