What I wish to point out is this: that to any situation all three reactions may take place and modify one another. We are insulted--some one slaps our face--the fierce emotion of anger arises and through us surge waves of feeling manifested on the motor side by tensed muscles, rapid heart, harsh breathing, perhaps a general reddening of face and eyes. Instinctively our fists are clenched, a part of the reaction of fight, and it needs but the slightest increase of anger to send us leaping on the aggressor, to fight him perhaps to the death. But no,--the situation has aroused certain memories and certain inhibitions: the one who struck us has been our friend and we can see that he is acting under a mistaken impression, or else we perceive that he is right, that we have done him a wrong for which his blow is a sort of just reaction. We are checked by these cerebral activities, we choose some other reaction than fight; perhaps we prevent him from further assault, or we turn and walk away, or we start to explain, to mollify and console, or to remonstrate and reprove. In other words, "intelligence" steps in to inhibit, to bring to the surface the possibilities, to choose, and thus overrides the emotional instinctive reaction. It may not succeed in the overriding; we may hesitate, inhibit, etc., for only a second or so, before hot anger overcomes us, and the instinctive response of fight and retaliation takes place. These examples might be multiplied a thousandfold. Every day of our lives situations come up in which there is a blending or an antagonism between emotional, instinctive and intelligent responses. In fact, very few acts of the organized human being are anything else. For every emotion awakens memories of past emotions and the consequences; every instinct is hampered by other instincts or by the inhibitions aroused by obstacles; and intelligence continually struggles against emotion and blind instinct. Teaching, experience, knowledge, all modify emotional and instinctive responses so that sometimes they are hardly recognizable as such. On the other hand, though intelligence normally occupies the seat of power, it is easily ousted and in reality only steers and directs the vehicle of life, choosing not the goal but the road by which the goal can safely be reached. In general terms we shall define emotions, instincts and intelligence as follows: