“Men have a great deal of pleasure in human knowledge, in studies of natural things; but this is nothing to that joy which arises from divine light shining into the soul. This spiritual light is the dawning of the light of glory in the heart. There is nothing so powerful as this to support persons in affliction, and to give the mind peace and brightness in this stormy and dark world. This knowledge will wean from the world, and raise the inclination to heavenly things. It will turn the heart to God as the fountain of good, and to choose him for the only portion. This light, and this only, will bring the soul to a saving close with Christ. It conforms the heart to the gospel, mortifies its enmity and opposition against the scheme of salvation therein revealed: it causes the heart to embrace the joyful tidings, and entirely to adhere to, and acquiesce in the revelation of Christ as our Savior.”

“In the soul where Christ savingly is, there He lives. He not only lives without it, so as violently to actuate it, but He lives in it, so that the soul also is alive. Grace in the soul is as much from Christ, as the light in a glass, held out in the sunbeams, is from the sun. But this represents the manner of the communication of grace to the soul only in part; because the glass remains as it was, the nature of it not being at all changed; it is as much without any lightsomeness in its nature as ever. But the soul of a saint receives light from the Sun of Righteousness, in such a manner that its nature is changed, and it becomes properly a luminous thing; not only does the sun shine in the saints, but they also become little suns, partaking of the nature of the Fountain of their light. In this respect, the manner of their derivation of light is like that of the lamps in the tabernacle, rather than that of a reflecting glass; which, though they were lit up by fire from heaven, yet thereby became themselves burning shining things.”

“But saints and angels behold that glory of God which consists in the beauty of His holiness; and it is this sight only that will melt and humble the hearts of men, wean them from the world, draw them to God, and effectually change them. A sight of the awful greatness of God may overpower men's strength, and be more than they can endure; but if the moral beauty of God be hid, the enmity of the heart will remain in its full strength. No love will be enkindled; the will, instead of being effectually gained, will remain inflexible. But the first glimpse of the moral and spiritual glory of God shining into the heart produces all these effects as it were with omnipotent power, which nothing can withstand.”

“But yet it is evident that religion consists so much in affection, as that without holy affection there is no true religion; and no light in the understanding is good which does not produce holy affection in the heart: no habit or principle in the heart is good which has no such exercise; and no external fruit is good which does not proceed from such exercises.”

“As it is with spiritual discoveries and affections given at first conversion, so it is in all subsequent illuminations and affections of that kind; they are all transforming. There is a like divine power and energy in them as in the first discoveries; they still reach the bottom of the heart, and affect and alter the very nature of the soul, in proportion to the degree in which they are given. And a transformation of nature is continued and carried on by them to the end of life, until it is brought to perfection in glory.”

“If the heart be chiefly and directly fixed on God, and the soul engaged to glorify him, some degree of religious affection will be the effect and attendant of it. But to seek after affection directly and chiefly; to have the heart principally set upon that; is to place it in the room of God and his glory. If it be sought, that others may take notice of it, and admire us for our spirituality and forwardness in religion, it is then damnable pride; if for the sake of feeling the pleasure of being affected, it is then idolatry and self-gratification.”

“But that is the nature of true grace and spiritual light, that it opens to a person's view the infinite reason there is that he should be holy in a high degree. And the more grace he has, and the more this is opened to view, the greater sense he has of the infinite excellency and glory of the divine Being, and of the infinite dignity of the person of Christ, and the boundless length and breadth and depth and height of the love of Christ to sinners. And as grace increases, the field opens more and more to a distant view, until the soul is swallowed up with the vastness of the object, and the person is astonished to think how much it becomes him to love this God and this glorious Redeemer that has so loved man, and how little he does love. And so the more he apprehends, the more the smallness of his grace and love appears strange and wonderful: and therefore he is more ready to think that others are beyond him.”