प्रतिग्रहग्रहणविश्वस्तस्य हि परश्छिद्रेषु निरपेक्षः प्रहरति ॥ कZ_०७.१७.१४ ॥
pratigraha-grahaṇa-viśvastasya hi paraś chidreṣu nirapekṣaḥ praharati
For one who has become complacently trusting because a counter-pledge has been taken, the enemy strikes without hesitation at his vulnerabilities.
Never let formal safeguards substitute for continuous vigilance; adversaries search for ‘chidra’ (gaps) and will exploit them when you relax.