मनुस्मृति - फलं कतकवृक्षस्य

फलं कतकवृक्षस्य यद्यप्यंबुप्रसादकं ।
न नाम ग्रहणादेव तस्य वारि प्रसीदति ॥

- मनुस्मृति

phalaM katakavRukShasya yadyapi ambuprasAdakam ।
na nAma grahaNAdeva tasya vAri prasIdati ॥

- manu smriti

The seeds of the clearing nut plant (Strychnos Potatorum) is known to clear the water of suspended particles. But mere uttering its name will not do it. Knowledge is similar - it has to be applied, not just recited.

- Manu Smriti