Better trust all, and be deceived,
And weep that trust, and that deceiving;
Than doubt one heart, that, if believed,
Had blessed one's life with true believing.
Oh, in this mocking world, too fast
The doubting fiend o'ertakes our youth!
Better be cheated to the last,
Than lose the blessèd hope of truth.

Frances Anne Kemble

http://www.poemhunter.com/poem/faith-179/