'It is a great and common sin throughout the Christian world, to take up religion in a way of faction; and instead of a love and tender care of the universal Church, to confine that love and respect to a party. No but that we must prefer, in our estimation and communion, the purer parts before the impure, and refuse to participate with any in their sins; yet the most infirm and diseased part should be compassioned and assisted to the utmost of our power; and communion must be held as far as is lawful, and nowhere avioided, but upon the urgency of necessity...'
Richard Baxter, The Reformed Pastor, p.157.