Small men think they are small; great men never know they are great

Similar sayings:

Great boast, small roast Great boast, small roast
Small ills are the fountains of most of our groans Men trip not on mountains, they stumble on stones Small ills are the fountains of most of our groans Men trip not on mountains, they stumble on stones
Great blessings come from heaven; small blessings come from man Great blessings come from heaven; small blessings come from man
In the midst of great joy do not promise to give a man anything; in the midst of great anger do not answer a man’s letter In the midst of great joy do not promise to give a man anything; in the midst of great anger do not answer a man’s letter
Covetous men’s chests are rich, not they Covetous men’s chests are rich, not they

Chinese sayings and proverbs