The human soul, a unit, indivisible, and without parts, nevertheless acts in three directions—of will, affection, intellect. These are distinguishable, though not divisible. Every one knows the difference between an _act_; an _emotion_ of anger, pity, sorrow, love; and a process of logic, or an intellectual argument. These are the three primary states of the mind, evidently distinct. It is impossible to mistake either for the other. I may direct my mind towards action, towards thought, or towards emotion. The first of these, action, is the most within my own power, depends chiefly on myself, lies nearest the will. _Will_ passes instantaneously into action. I will to lift my arm, and it is done. On the other hand, feeling or emotion lies the farthest from this centre of will, depends least of all on my own choice, and in it I am most passive. But the sphere of intellect is intermediate. I am more free when I think than when I feel; less free than when I act. In the domain of will, I act upon external things; in the domain of feeling, I am acted upon by external things; in the domain of intellect, I neither act nor am acted upon, but I _see_ them. In all thinking, in proportion as it is pure thought, both will and emotion are excluded. We are neither actors nor sufferers, but spectators. Things seen pass into our life through the intellect, and become sources of emotion and action. Love of truth causes us to desire to know it; this desire leads us to put our mind in the presence of truth, but when there, the functions of emotion and will cease, and all we have to do is to look.