And from the Han Civilization:
Ziziweizizi, buziweibuzi, shiziye
Wisdom is recognizing that you know if you know and recognizing that you do not know if you do not know.
Sanrenxingbuyouwoshiye.
I can always find my teacher from three men. (I find what is virtuous from them and create it in myself, and I find what is vicious from them and rid of the vice in myself.)
And from the Yamato Civilization,
Hitonochoujouhanusume.
Steal (emulate) the virtues of others.
Korondemotadadehaokinu.
Literal: If you trip, don't get up for free. Meaning: Life gives you lemon, make lemonade.
"He's so far [back] in the closet, he's in Narnia." I personally love this one, as it's a reference to a book I love, The Lion, The Witch and the Wardrobe, but refers to how much someone is hiding his homosexuality.
"He's going so slow, he'd have to speed up to stop." That's pretty slow!
I have a friend who says "Hell to the NO!" Which is a dramatic way of saying "No way!"