स्व्भावं न जहात्येव साधुरापद्गतोऽपि सन् ।
कर्पूरः पाव्कस्पृष्टः सौरभं लभतेतराम् ॥
A good person never gives up his nature even when he is caught in calamity. Camphor caught with fire emits more frgrance.
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http://sanskrit.samskrutam.com/en.literature-shloka-subhaasitam.ashx