The devil scatters the flock of Christ, and sets them one against another, and that with great heat of spirit, under a notion of zeal for God; and religion, by degrees, degenerates into vain jangling; and during the strife, Satan leads both parties far out of the right way, driving each to great extremes, one on the right hand and the other on the left, according as he finds they are most inclined, or most easily moved and swayed, till the right path in the middle is almost wholly neglected.

Jonathan Edwards, Religious Affections, pp. 19-20