One must not trust another who should not be trusted, nor put too much trust on one worthy of trust. The calamity born of such trust cuts down even the very roots.
न विश्वसेदविश्वस्ते विश्वस्ते नातिविश्वसेत्। विश्वासाद् भयमुत्पन्नं मूलान्यपि निकृन्तति॥