Thomas Boston, Works, 2:346:
Thy condition, whatever it is, is for God’s honour; for it is ordered by him who does all for that end, and cannot fail of his design. Though thou dost not see how it is so, thou mayest believe that it is so, upon this ground. Providence runs much under ground, so as weak man cannot see how the means answer the end: but God sees it, and that is enough. This is a contenting consideration to a gracious soul, that will be pleased with that which may glorify God, Phil. 1:20.
Source: http://www.puritanboard.com/f25/providence-runs-much-under-ground-83057/, Comment #1 (Thank You, Reverend Winzer!)