What are the best sentences about selfless dedication or responsibility in ancient China?

A sentence of selfless dedication or responsibility

Silkworms in spring will weave until they die, and candles will drain the wick every night.

Falling red is not heartless, but turning into spring mud protects flowers more.

A scholar should not be unfaithful, for he has a long way to go. Isn't benevolent important? Not far from death?

Excerpted from Baidu homework help.