1525 · Martin Luther, The Bondage of the Will (De Servo Arbitrio) 35
And what, throughout the Old Testament, in the 119th Psalm especially, is more frequently said in praise of the Scripture, than that, it is itself a most certain and most clear light? For Ps. cxix. 105, celebrates its clearness thus: “Thy word is a lamp unto my feet and a light unto my paths.” He does not say only — thy Spirit is a lamp unto my feet; though he ascribes unto Him also His office, saying, “Thy good Spirit shall lead me into the land of uprightness.” (Ps. cxliii. 10.) Thus the Scripture is called a “way” and a “path:” that is from its most perfect certainty.