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>something like an is/ought problem
St. Philaret actually addresses this issue in the Orthodox Catechism:
>6. What is faith?
According to the definition of St. Paul, Faith is the substance of things hoped for, the evidence of things not seen (Heb. xi. 1); that is, a trust in the unseen as though it were seen, in that which is hoped and waited for as if it were present.
>7. What is the difference between knowledge and faith?
Knowledge has for its object things visible and comprehensible; faith, things which are invisible, and even incomprehensible. Knowledge is founded on experience, on examination of its object; but faith on belief of testimony to truth. Knowledge belongs properly to the intellect, although it may also act on the heart; faith belongs principally to the heart, although it is imparted through the intellect.
>8. Why is faith, and not knowledge only, necessary in religious instruction?
Because the chief object of this instruction is God invisible and incomprehensible, and the wisdom of God hidden in a mystery; consequently, many parts of this learning can not be embraced by knowledge, but may be received by faith.
Faith, says St. Cyril of Jerusalem, is the eye which enlighteneth every man's conscience; it giveth man knowledge. For, as the prophet says, If ye will not believe, ye shall not understand. Isa. vii. 9; Cyr. Cat. v.
>9. Can you illustrate further the necessity of faith?
St. Cyril thus illustrates it:
It is not only amongst us, who hear the name of Christ, that faith is made so great a thing; but every thing which is done in the world, even by men who are unconnected with the Church, is done by faith. Agriculture is founded on faith; for no one who did not believe that he should gather in the increase of the fruits of the earth would undertake the labor of husbandry. Mariners are guided by faith when they intrust their fate to a slight plank, and prefer the agitation of the unstable waters to the more stable element of the earth. They give themselves up to uncertain expectations, and retain for themselves nothing but faith, to which they trust more than to any anchors. Cyr. Cat. v.