If the heart be directly and chiefly 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 and admire us for our spirituality and forwardness in religion, it is then abominable pride: if for the sake of feeling the pleasure of being affected, it is then idolatry and self-gratification.

—David Brainerd
The Works of Jonathan Edwards, 2:414.