All the darkness in the world can't put out the light of one candle.

Do not treat others as you yourself would not be treated.

He who knows all the answers has not been asked all the questions.

Excessive (population) growth may reduce output per worker, repress levels of living for the masses and engender strife

An orchid in a deep forest sends out its fragrance even if no one is around to appreciate it.

It is not the failure of others to appreciate your abilities that should trouble you, but rather your failure to appreciate theirs.

Better a diamond with a flaw than a pebble without.