Sa'di says

On the Excellence of Contentment

An African mendicant, in the street of the mercers of Aleppo, said, "O wealthy sirs! if you had but justice and we contentment, the custom of begging would be banished from the world."
Contentment! do thou me enrich; for those
Who have thee not are blest with wealth in vain.
Wise Luqman for his treasure patience chose:
Who have not patience wisdom ne'er attain