The fact that they are Reason-Principles. Every life is some form of thought, but of a dwindling clearness like the degrees of life itself. The first and clearest Life and the first Intelligence are one Being. The First Life, then, is an Intellection and the next form of Life is the next Intellection and the last form of Life is the last form of Intellection. Thus every Life, of the order strictly so called, is an Intellection.
But while men may recognize grades in life they reject grade in thought; to them there are thoughts [full and perfect] and anything else is no thought.
This is simply because they do not seek to establish what Life is.
The essential is to observe that, here again, all reasoning shows that whatever exists is a bye-work of visioning: if, then, the truest Life is such by virtue of an Intellection and is identical with the truest Intellection, then the truest Intellection is a living being; Contemplation and its object constitute a living thing, a Life, two inextricably one.
The duality, thus, is a unity; but how is this unity also a plurality?