Subhashitam - 48

उपदेशोहि मूर्खाणां प्रकोपाय न शान्तये ।
पयः पानं भुजंगानां केवलं विषवर्धनम् ॥

Meaning:
Milk consumed by snakes increases their poison. Similarly advice given to fools make them even more furious instead of pacifying them.