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.
For psychological purposes the most important differences in conation are those in virtue of which the object is revealed as sensed or perceived or imaged or remembered or thought.
In the perception of a tree we can distinguish the act of experiencing, or perceiving, from the thing experienced, or perceived.
It is more difficult to designate this form of conation on its practical side by a satisfactory name.
But unfortunately Locke treated ideas of reflection as if they were another class of objects of contemplation beside ideas of sensation.
Mental life is indeed practical through and through. It begins in practice and it ends in practice.