"The constantly recurring question must be: What shall we unite with and from what shall we separate? The question of coexistence does not enter here, but the question of union and fellowship does. The wheat grows in the same field as the tares, but shall the two cross-pollinate? The sheep graze near the goats, but shall they seek to interbreed? The unjust and the just enjoy the same rain and sunshine, but shall they forget their deep moral differences and intermarry? ... The Spirit-illuminated church will have none of this"