Changes

We have in all functionings of the mentality four elements, the object of mental consciousness, the act of mental consciousness, the occasion and the subject. In the self-experience of the self-observing inner being, the object is always some state or movement or wave of the conscious being, anger, grief or other emotion, hunger or other vital craving, impulse or inner life reaction or some form of sensation, perception or thought activity. The act is some kind of mental observation and conceptual valuation of this movement or wave or else a mental sensation of it in which observation and valuation may be involved and even lost,—so that in this act the mental person may either separate the act and the object by a distinguishing perception or confuse them together indistinguishably. <ref>http://incarnateword.in/cwsa/21/memory-ego-and-self-experience#p5</ref>

You may have a mental power of observation, a vital power of observation, a physical power of observation. When you observe ideas, for instance, the train of ideas, the logic of the ideas, it is not altogether the same power of observation as when you look at a friend doing athletics and see whether he is making his movements correctly or not. That is, the capacity of attention is there in both cases, but it works in a different field. It can't be said that it is one part of the being observing the others; it is the faculty of observation developing in each part of the being—that is, the faculty of concentration and attention.