Life is but a span.

人生如朝露。

Never neglect an opportunity for improvement.

抓住大好时机，切莫等闲错过。

Older and wiser.

越老越聪明。

Shallow streams make most din.

修养不深，高谈阔论。

The healthful man can give counsel to the sick.

健康的人可以对生病的人提出忠告。

The sky is not less blue because the blind man does not see it.

天不会因瞎子看不见而减其蓝色。