We have another source of error in diseases.[52] They spoil the judgment and the senses; and if the more serious produce a sensible change, I do not doubt that slighter ills produce a proportionate impression.
Our own interest is again a marvellous instrument for nicely putting out our eyes. The justest man in the world is not allowed to be judge in his own cause; I know some who, in order not to fall into this selflove, have been perfectly unjust out of opposition. The sure way of losing a just cause has been to get it recommended to these men by their near relatives.