पञ्चतंत्र - काकोलुकीय - रिपुः

आसने शयने याने पानभोजनवस्तुषु |
दृष्टादृष्टप्रमत्तेषु प्रहरन्त्यरयोऽरिषु ||

- पञ्चतंत्र, काकोलुकीय

Enemies can strike you at any time - sitting, sleeping, traveling, eating, drinking, lost in thought about material and philosophical issues. Hence one must never let down his guard.

- Panchatantra, Kakolukiya