Trust me the meed of praise, dealt thriftily
From the nice scale of judgement, honours more
Than does the lavish and o'erbearing tide
Of profuse courtesy. Not all the gems
Of India's richest soil at random spread
O'er the gay vesture of some glittering dame,
Give such alluring vantage to the person,
As the scant lustre of a few, with choice
And comely guise of ornament disposed.

William Cowper

http://www.poemhunter.com/poem/in-a-letter-to-c-p-esq-in-imitation-of-shakspeare/