"...We begin with thought, as it is in a quite abstract, natu-ral or sensuous form, and we proceed from this to the Idea as determined. This first period shows the begin-ning of philosophic thought and goes on to its develop-ment and perfection as a totality of knowledge in itself; this takes place in Aristotle as representing the unity of what has come before.
In Plato there is just such a un-ion of what came earlier, but it is not worked out, for he only represents the Idea generall ...