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How sharper than a serpent's tooth is to have a thankless child.

"Every family is a haunted house."

The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colors or the words, must fit together in a harmonious way.

當幫助人們擺脫貧困陷阱時，微小的改變可以產生巨大的影響。