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.

It may be added, to prevent misunderstanding, that when I speak of contemplated objects in this last phrase as objects of contemplation, the act of contemplation itself is of course an enjoyment.

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

An expectation is a future object, recognised as belonging to me.

Curiosity begins as an act of tearing to pieces or analysis.

An object is not first imagined or thought about and then expected or willed, but in being actively expected it is imagined as future and in being willed it is thought.

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