Selection from Arcana Cœlestia ~ Emanuel Swedenborg
Nothing but truths constitute intelligence, since those who are in truths from good are in intelligence; for through truths from good the intellectual mind is in the light of heaven, and the light of heaven is intelligence, because it is Divine truth from Divine good.The truth in man is not the truth of intelligence until it is led by means of good; and when it is led by means of good, it then for the first time becomes the truth of intelligence. For truth has no life from itself, but from good, and it has life from good when man lives according to truth; for then it infuses itself into man's will, and from his will into his actions, thus into the whole man.
The truth which man only knows or apprehends, remains outside of his will, and so outside of his life; for man's will is his life. But when man wills the truth, it is then on the threshold of his life; and when from willing he does it, then the truth is in the whole man; and when he does it frequently, it not only recurs from habit, but also from affection, thus from freedom.
Let anyone who pleases, consider whether man can be imbued with anything but that which he does from will. That which he only thinks and does not do, and still more that which he thinks and is not willing to do, is merely outside of him, and is also dissipated like chaff by the slightest wind, as it is in fact dissipated in the other life; from which it may be known what faith is without works.
From these things it is now plain what the truth of intelligence is, namely, that it is the truth which is from good. Truth is predicated of the understanding, and good of the will, or what is the same, truth is of doctrine and good is of life.
(from Arcana Cœlestia 4884)