The fruits of unity (next unto the well pleasing of God, which is all in all) are two: the one, towards those that are without the church, the other, towards those that are within. For the former; it is certain, that heresies, and schisms, are of all others the greatest scandals; yea, more than corruption of manners. For as in the natural body, a wound, or solution of continuity, is worse than a corrupt humor; so in the spiritual. So that nothing, doth so much keep men out of the church, and drive men out of the church, as breach of unity. And therefore, whensoever it cometh to that pass, that one saith, Ecce in deserto, another saith, Ecce in penetralibus; that is, when some men seek Christ, in the conventicles of heretics, and others, in an outward face of a church, that voice had need continually to sound in men's ears, Nolite exire,--Go not out.

03 Of Unity in Religion by Francis Bacon