2. No one knows what a person's life is unless he knows that it is love. Without knowing this, one may believe that a person's life is simply sensing and acting, another that it is thinking, when in fact thought is the first effect of life, and sensation and action its second effect. (We say that thought is the first effect of life, but there exists an interior thought and a still more interior one, and an exterior thought and a still more exterior one. The inmost thought, which is a perception of ends or purposes, is actually the first effect of life. However, these levels of thought will be discussed below where we take up the degrees of life.)