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人們不是因為變老而停止追求夢想，而是因為停止追求夢想而變老。

偵查的藝術不在于看到可見之物，而在于察覺無形之物。

來訪者知道什么傷害了他，該往哪個方向走，哪些問題是關鍵的，哪些經歷被深深埋藏。

The work of art is the result of a struggle between the artist and his material.

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.

Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.

黃金時代在我們面前而不在我們背后。