Thomas Manton deduces three rules for making sound judgments in accordance with the apostle James’s command to “count it all joy, my brothers, when you meet trials of various kinds” (James 1:2 ESV). The second is as follows:
Judge by a supernatural light. Christ’s eye-salve must clear your sight, or else you cannot make a right judgment: there is no proper and fit apprehension of things till you get within the veil, and see by the light of a sanctuary lamp: 1 Cor. ii. 11, ‘The things of God knoweth no man, but by the Spirit of God.’ He had said before, ver. 9, ‘Eye hath not seen, ear hath not heard,’ &c.; i.e., natural senses do not perceive the worth and price of spiritual privileges; for I suppose the apostle speaketh not there of the incapacity of our understandings to conceive of heavenly joys, but of the unsuitableness of spiritual objects to carnal senses. A man that hath no other light but reason and nature, cannot judge of those things; God’s riddles are only open to those that plough with God’s heifer: and it is by God’s Spirit that we come to discern and esteem the things that are of God; which is the main drift of the apostle in that chapter. So David, Ps. xxxvi. 9, ‘In thy light we shall see light;’ that is, by his Spirit we come to discern the brightness of glory or grace, and the nothingness of the world.
—Thomas Manton, The Works of Thomas Manton, vol. 4, A Practical Commentary: or an Exposition with Notes on the Epistle of James (London: James Nisbet & Co., 1871), 22.