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Every man is born as many men and dies as a single one.

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.

The deepest theorems often arise from the simplest observations.

道自安靜之中得來，德于謙讓之中養成，福在清儉之中積累，命于和暢之中保全。