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उत्तिष्ठत जाग्रत प्राप्य वरान्निबोधत।
क्षुरस्य धारा निशिता दुरत्यया दुर्गं पथस्तत्कवयो वदन्ति ॥

_{Arise, awake, find out the great ones and learn of them; for sharp as a razor’s edge is hard to traverse and difficult to go is that path, say the sages.}

1.3.14, Katha Upanishad