MT ST TEI Ethics TPT Corr. By idea, I mean the mental conception which is formed by the mind as a thinking thing.
Duration is the indefinite continuance of existing.
Reality and perfection I use as synonymous terms. We perceive that a certain body is affected in many ways. We feel and perceive no particular things, save bodies and modes of thought. Thought is an attribute of God, or God is a thinking thing. Extension is an attribute of God, or God is an extended thing.