(67) And herein lies the whole Christian doctrine: He that teacheth otherwise does not know what he teacheth, for his doctrine has no foot, ground or foundation, and his heart always tottereth, wavereth and doubteth, and knoweth not what it should do.

(7) But this much is enough, since it is impossible for anyone to dispute the nature of the words I have just spoken about the blessed, imperishable, true God. Now, if anyone wants to believe the words set down (here), let him go from what is hidden to the end of what is visible, and this Thought will instruct him how faith in those things that are not visible was found in what is visible. This is a principle of knowledge.

(42) For it lies not in thy unbelief [or ignorance] to hinder it; thy unbelief does not take away or make void the truth of God: but faith bloweth up the spirit of hope, and testifieth that we are God's children. The faith is generated in the flash, and wrestleth so long with God till it overcometh and gets the victory.

(48) Christ said, “He that believeth not,” or will not or cannot believe, “shall be damned.” It is so of a truth; for a man, while he is in this present time, hath not knowledge; and he cannot attain unto it, unless he first believe. And he who would know before he believeth, cometh never to true knowledge. We speak not here of the articles of the Christian faith, for every one believeth them, and they are common to every Christian man, whether he be sinful or saved, good or wicked; and they must be believed in the first place, for without that, one cannot come to know them. But we are speaking of a certain Truth which it is possible to know by experience, but which ye must believe in, before that ye know it by experience, else ye will never come to know it truly. This is the faith of which Christ speaketh in that saying of His.

(2) Indeed it has a true foundation, which, in the spirit, I know to be so; but their knowledge stands only in the house of death, in the outward comprehensibility or palpability, and in the beholding with the eyes of the body; but the root of this tree has hitherto remained hidden from them.

(135) From this God I take my knowledge, and from no other thing, neither will I know any other thing than that same God, and the same it is which makes that assurance in my spirit, that I steadfastly believe and trust in him.