Your word is a lamp unto my feet, and a light unto my path.
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Augustine of Hippo
105. "Thy word is a lantern unto my feet, and a light unto my paths" (ver. 105). The word "lantern" appears in the word "light;" "my feet" are also repeated in "my paths." What then meaneth "Thy Word"? Is it He who was in the beginning God with God, that is, the Word by whom all things were made? It is not thus. For that Word is a light, but is not a lantern. For a lantern is a creature, not a creator; and it is lighted by participation of an unchangeable light. ...For no creature, howsoever rational and intellectual, is lighted by itself, but is lighted by participation of eternal Truth: although sometimes day is spoken of, not meaning the Lord, but that "day which the Lord hath made," and on account of which it is said, "Come unto Him, and be lightened." On account of which participation, inasmuch as the Mediator Himself became Man, He is styled lantern in the Apocalypse. But this sense is a solitary one; for it cannot be divinely spoken of any of the saints, nor in any wise lawfully...
Thy word. Jesus Christ, (St. Hilary) who enlightens every man, John i.
Lamp, (2 Peter i. 19., and Proverbs vi. 23.) while sin is the light of the wicked, Proverbs xxi. 4., and xxiv. 20. (Berthier)
The law of God, proposed by his prophets and pastors, in the ordinary method of instruction. (Worthington)