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Confucious said that real knowledge is knowing the extent of one's ignorance.Aristotle and Socrates said the same thing.Is it a skill that can be taught or learned? It probably can, if you have enough of a stake riding on the outcome...

感恩是負面情緒的解毒劑，是嫉妒、敵意、擔憂和憤怒的中和劑。

My greatest happiness is being able to move people with my singing.

The truth is rarely pure and never simple.