What are we to say if there be no suffering? We might answer that the actualization of him who acts is simply present in such a thing (without correlative reaction). There are thus two manners of acting; to act within oneself, and to act outside of oneself. No more will it then be said that the first mode is proper acting, and the second reacting, but that there are two ways of acting outside of oneself, acting and reacting. For instance, writing is an operation in which one acts on something else without a correlative reaction, because in writing one produces nothing but the very actualization of writing, and not something else, like experiencing; for the quality of writing that has been produced is nothing that reacts (or, experiences). As to walking, though the earth be stepped on by the feet, it does not react (or, experience) as a consequence. On the contrary, if it be the body of an animal that is trod under feet, it may be conceived that there is reaction, because one then thinks of the suffering endured by the animal thus trod on, and not of the walking; otherwise, this reaction would have been conceived before (the notion of this reaction would have been implied in the very notion of walking). ACTION AND REACTION FORM BUT A SINGLE GENUS. Thus, in everything, acting forms but a single genus along with reacting, which (by the Aristotelians) is considered its opposite. Reacting is what follows acting, without being its contrary; to be burnt, for instance, follows burning, but is not its contrary. In this case, the reaction is what results in the object itself from the fact of burning, or of being burnt, which form but one (process), whether the result be suffering, or something else, as, for instance, depreciation. It might be objected, When one (being) makes another suffer, is it not true that the one acts, and the other reacts? Here from a single actualization result two facts, an action, and a reaction. Besides, it is not necessary to include in the action the will to cause suffering; it has only produced something else as a result of which it causes suffering, something which occurring in the being that suffers, and being one single (occurrence), that causes suffering. What then is this one identical thing which is anterior to the suffering? When there is no suffering, is there not nevertheless a reaction in him in whom is the modification? For instance, in him who hears? No: to hear is not to react, and sensation is not really a reaction;[278] but to suffer is to experience a reaction, and the reaction is not the contrary of the action (in the sense we have explained). REACTIONS NEED NOT BE PASSIVE, BUT MAY BE ACTIVE.