Education does not take root in the soul unless it goes deep.
Life is a leaf of paper white，thereon each of us may write his word or two.
The fool doth think he is wise, but the wise man knows himself to be a fool.
I’m sure the universe is full of intelligent life. It’s just been too intelligent to come here.
【講解】：（教學(xué)生）不到他苦思冥想怎么也弄不明白的時(shí)候，不去開導(dǎo)他；不到他想說而又說不出來的時(shí)候，不去啟發(fā)他。告訴他（四方形）的一個(gè)角，他不能由此推出另外三個(gè)角，就不再往下教他（新知識(shí)）了。
生存還是毀滅，這是一個(gè)問題。