If you do something once, people will call it an accident. If you do it twice, they call it a coincidence. But do it a third time and you've just proven a natural law.
要我说,人性之善是不能用金钱衡量的,善即是善,钱即是钱,可不要把麦子和谷壳搞混了。
The child is not a passive recipient of knowledge but an active participant in the learning process.