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

The interval between a cold expectation and a warm desire may be filled by expectations of varying degrees of warmth or by desires of varying degrees of coldness.

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

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

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

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

The thing of which the act of perception is the perception is experienced as something not mental.