Actions such as a smile, or staring, or frowning, or nodding, or moving the eyes or the head, have ideas behind them. Externally it is a slight movement; behind it there is a mountain of thought. No movement is possible without a thought at the back of it. Sometimes it is known to the person and sometimes the person himself does not know why he smiled. The eyes express more than anything else, by their movements, the idea behind them. Very often intuitive people say, "I perceived from that person's look, pleasure," (or "displeasure") or "his favorable" (or "unfavorable") "attitude." And yet many do not know what movement, what expression, suggested to them what they perceived. Every expression of the eyes, the eyes which change their expression so many times in one minute, suggests the idea behind. This shows that the mind is an engineer and the body is a mechanism which it works. If the engineer becomes conscious of his working he brings about desirable results, but by unconscious working the engineer also becomes a mechanism.