If we saw a concept or word as a kind of unity among many, we could distinguish it by its different kinds of unity. The mind makes one kind of unity out of seeing several trees or several men, and another after seeing the divisions between cause and effect, substance and accident, and even in the various things it calls “one” or “unified”. The general division is therefore between the unity of homogeneity and the unity of order (which presupposes heterogeneity).