Two sacraments I do believe there be,
Baptism and the Supper of the Lord;
Both mysteries divine, which do to me,
By God's appointment, benefit afford.
But shall they be my God, or shall I have
Of them so foul and impious a thought,
To think that from the curse they can me save?
Bread, wine, nor water, me no ransom bought.

John Bunyan

http://www.poemhunter.com/poem/upon-the-sacraments/