弘明集 8.69

8.69

釋曰。息心達源號曰沙門。此則練神濯穢反流歸。潔即沙汰之謂也。子欲毀之。而義愈美。真可仰之彌高。鑽之彌堅者也。

The explanation says: Quieting the mind and reaching the source is called shamen (śramaṇa). This means refining the spirit, washing away defilements, turning back the flow, and returning to purity—this is precisely what 'sifting and weeding out' means! You intended to defame it, but its meaning becomes all the more splendid. It can truly be said: 'The more one looks up to it, the higher it becomes; the more one penetrates it, the harder it gets!'