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 sensory acts are accordingly distinguished by their objects.

Psychology is the science of the act of experiencing, and deals with the whole system of such acts as they make up mental life.

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.

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

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.

Mental life is indeed practical through and through. It begins in practice and it ends in practice.