उत्तिष्ठत जाग्रत
प्राप्य वरान्निबोधत ।
क्षुरस्य धारा निशिता दुरत्यया
दुर्गं पथस्तत्कवयो वदन्ति ॥
- कठोपनिषद्, १.३.१४

Arise, awake, approach the great ones and learn from them. The path is difficult to cross, like walking on sharp edge of a knife, say the sages.