Millions of items…are present to my senses which never properly enter into my experience. Why? Because they have no interest for me. My experience is what I agree to attend to…. Everyone knows what attention is. It is the taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought. Focalization, concentration of consciousness, are of its essence. It implies withdrawal from some things in order to deal effectively with others.
