An ass may bray a good while before he shakes the stars down

Every ass loves to hear himself bray

Doth the wild ass bray when he hath grass? or loweth the ox over his fodder? / Can that which is unsavoury be eaten without salt? or is there any taste in the white of an egg? / The things that my soul refused to touch are as my sorrowful meat.

If a donkey bray at you, don't bray at him

When we are treated well, we naturally begin to think that we are not altogether unmeritous, and that it is only just we should treat ourselves well, and not mar our own good fortune.

It's but little good you'll do, a watering the last year's crop