Though in the nature thereof, that with which a purer metal is mixed, be not base; yet, it abases the purer metal. […] [T]hough silver be a precious metal, yet it abases gold. Grace, and peace, and faith, are precious parts of our treasure here; yet, if we mingle them, that is, compare them with the joys, and glory of heaven; […] we abase, and over-alloy these joys, and that glory.