Man is a sentient organism. The animal, as distinct from the plant, has a nervous system with sensory functions. There are sensory or afferent nerves, and also motor or efferent nerves. Appetition is the striving toward or away from objects. It is accompanied by various emotions and feelings.
Man is a rational organism.
Rationality implies intellectual cognition and rational appetition. The power of rational appetition is the will , and the exercise of this power is volition or willing. The object of the will is the good . An important feature of rational appetition is that of moral good and moral wrong and the consciousness of personal responsibility . This is based on the conviction of mankind that man has a free will possessing the liberty of self-determination.