Subhaashita Sutras - 9

पीत्वा कर्दमपानीयं भेको रटरटायते ।

पक्वं चूतरसं पीत्वा गर्व नायाति कोकिलः ।।

नित्यनीतिः - 28

The frog proudly keeps croaking through it drinks filthy water. The cuckoo doesn't feel proud though it feeds on delicious mango juice.