The law of "Faith" = feith, fei, fai from Anglo-French and Old French feid, foi faith.
A man who is justified by faith is Faithful to a promise; loyalty to the Father - the Truth; honesty, truthfulness,
Faithful, from faith + -ful, one who is full of faith, true; honest, trustworthy, true to the facts. Faithfully; faithfulness.
Faith, Greek Pisteuō πιστεύω = to apprehend the truth - "the light of the world."
"Then said Jeshuah (יהשוה) to those Jews (יהודה) which (Pisteuō πιστεύ; apprehend the truth incarnated) in him, If ye continue in my word (Logos- Christ), then are ye my disciples indeed; And ye shall know the truth, and the truth shall make you free." - John *: 31, 32
And, what he is saying, is to have faith in Christ, the Logos, the Word, for the one that has incarnated the Cosmic Christ, who is the "Light" of the world.
"But as many as received him (the Cosmic Christ, the light of the world), to them gave he power to become the sons of God; Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. And the Word (the Cosmic Christ, the light of the world) was made flesh, and dwelt among "us," (and "we" beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth (the light of the world)."
Weep not: behold, the Lion of the tribe of Judah,
the Root of David, has prevailed to open the book,
and to loose the seven seals thereof. - Revelation 5: 5