Be content with your lot; one cannot be first in everything. Aesop
If you want to improve, be content to be thought foolish and stupid. Epictetus
The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic. Charles Darwin
Let every one be content with what God has given him. Portuguese Proverb
If God does not grant you glory, be content with fame. Brazilian Proverb
Never be content with your lot. Try for a lot more. American Proverb