Of whatever nature may be the combination of beings, their motion has always one direction or tendency: without direction we could not have any idea of motion: this direction is regulated by the properties of each being; as soon as they have any given properties, they necessarily act in obedience to them: that is to say, they follow the law invariably determined by these same properties; which, of themselves, constitute the being such as he is found, and settle his mode of action, which is always the consequence of his manner of existence. But what is the general direction, or common tendency, we see in all beings? What is the visible and known end of all their motion? It is to conserve their actual existence--to preserve themselves--to strengthen their several bodies--to attract that which is favorable to them--to repel that which is injurious them--to avoid that which can harm them--to resist impulsions contrary to their manner of existence, and to their natural tendency. To exist, is to experience the motion peculiar to a determinate essence: to conserve this existence, is to give and receive that motion from which results its maintenance:--it is to attract matter suitable to corroborate its being--to avoid that by which it may be either endangered or enfeebled. Thus, all beings of which we have any knowledge, have a tendency to conserve themselves, each after its peculiar manner: the stone, by the firm adhesion of its particles, opposes resistance to its destruction. Organized beings conserve themselves by more complicated means, but which are, nevertheless, calculated to maintain their existence against that by which it may be injured. Man, both in his physical and in his moral capacity, is a living, feeling, thinking, active being; who, every instant of his duration, strives equally to avoid that which may be injurious, and to procure that which is pleasing to him, or that which is suitable to his mode of existence; all his actions tending solely to conserve himself. ST. AUGUSTINE admits this tendency in all whether organized or not.