Thomas Boston, Works, 6:222:
Certainly meat can never be so sweet as to a hungry man; nor can one so much esteem wealth as he that has been pinched with poverty. The best view of the stars is from the bottom of a deep narrow pit. Surely the remembrance of the cross will sweeten the crown; and the memory of the wilderness will put an additional verdure on the fields of glory, when the saints shall be walking through them in their white robes, remembering the mournful blacks in which they were wont to appear. Let us not cast at our blessings, nor grudge to sow the seeds of glory.
Source: http://www.puritanboard.com/f25/remembrance-cross-will-sweeten-crown-84628/, Comment #1