Q.E.D.
Note .-- By this power of rightly arranging and associating the bodily modifications we can guard ourselves from being easily affected by evil emotions.

For (V.vii.) a greater force is needed for controlling the emotions, when they are arranged and associated according to the intellectual order, than when they, are uncertain and unsettled.

The best we can do, therefore, so long as we do not possess a perfect knowledge of our emotions, is to frame a system of right conduct, or fixed practical precepts, to commit it to memory, and to apply it forthwith[16] to the particular circumstances which now and again meet us in life, so that our imagination may become fully imbued therewith, and that it may be always ready to our hand.

For instance, we have laid down among the rules of life (IV.xlvi.and note), that hatred should be overcome with love or high--mindedness, and not required with hatred in return.

Now, that this precept of reason may be always ready to our hand in time of need, we should often think over and reflect upon the wrongs generally committed by men, and in what manner and way they may be best warded off by high--mindedness: we shall thus associate the idea of wrong with the idea of this precept, which accordingly will always be ready for use when a wrong is done to us (II.