A spoken word is not a sparrow. Once it flies out, you can't catch it.
Never take the antidote before the poison.
Court not companionship with tigers.
Be like a camel -- carrying sweets but dining on thorns.
To be simple is a pedestrian virtue, but to persevere in simplicity is a virtue of spiritual giants.
Running is away is a shame, but it is useful.
Don't trouble a quiet snake.
A falcon will not breed a dove.
One ill behaviour may cause others to forget the kindness we've done.