Martin Luther - The three lights which ought to be held in consideration

Let us therefore hold in consideration the three lights—the light of nature, the light of grace, and the light of glory; which is the common, and a very good distinction. By the light of nature, it is insolvable how it can be just, that the good man should be afflicted and the wicked should prosper: but this is solved by the light of grace. By the light of grace it is insolvable, how God can damn him, who, by his own powers, can do nothing but sin and become guilty. Both the light of nature and the light of grace here say, that the fault is not in the miserable man, but in the unjust God: nor can they judge otherwise of that God, who crowns the wicked man freely without any merit, and yet crowns not, but damns another, who is perhaps less, or at least not more wicked. But the light of glory speaks otherwise. That will shew, that God, to whom alone belongeth the judgment of incomprehensible righteousness, is of righteousness most perfect and most manifest; in order that we may, in the meantime, believe it, being admonished and confirmed by that example of the light of grace, which solves that, which is as great a miracle to the light of nature!


- Martin Luther (The Bondage of the Will, Section 166)