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It is so hard to believe because it is so hard to obey.

The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.

南懷瑾：諸法的本來面目就是空相，諸法的實相亦是空相，諸法未曾離開空相，故云是諸法空相……一切法的實相是空，是故一切法從本以來，不生不滅，不垢不凈，不增不減。

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.

"The past is a shadow that follows us, but it is the light ahead that guides our steps."