But unfortunately Locke treated ideas of reflection as if they were another class of objects of contemplation beside ideas of sensation.

The perceptive act is a reaction of the mind upon the object of which it is the perception.

You can mark in desire the rising of the tide, as the appetite more and more invades the personality, appealing, as it does, not merely to the sensory side of the self, but to its ideal components as well.

Desire then is the invasion of the whole self by the wish, which, as it invades, sets going more and more of the psychical processes; but at the same time, so long as it remains desire, does not succeed in getting possession of the self.

The mental act of sensation which issues in reflex movement is so simple as to defy analysis.

In the perception of a tree we can distinguish the act of experiencing, or perceiving, from the thing experienced, or perceived.

Both expectations and memories are more than mere images founded on previous experience.