Besides, through this view of the inevitableness of pain, of the supplanting of one pain by another, and the introduction of a new pain through the passing away of that which preceded it, one might be led to the paradoxical but not absurd hypothesis, that in every individual the measure of the pain essential to him was determined once for all by his nature, a measure which could neither remain empty, nor be more than filled, however much the form of the suffering might change. Thus his suffering and well-being would by no means be determined from without, but only through that measure, that natural disposition, which indeed might experience certain additions and diminutions from the physical condition at different times, but yet, on the whole, would remain the same, and would just be what is called the temperament, or, more accurately, the degree in which he might be ευκολος or δυσκολος, as Plato expresses it in the First Book of the Republic, _i.e._, in an easy or difficult mood. This hypothesis is supported not only by the well-known experience that great suffering makes all lesser ills cease to be felt, and conversely that freedom from great suffering makes even the most trifling inconveniences torment us and put us out of humour; but experience also teaches that if a great misfortune, at the mere thought of which we shuddered, actually befalls us, as soon as we have overcome the first pain of it, our disposition remains for the most part unchanged; and, conversely, that after the attainment of some happiness we have long desired, we do not feel ourselves on the whole and permanently very much better off and agreeably situated than before. Only the moment at which these changes occur affects us with unusual strength, as deep sorrow or exulting joy, but both soon pass away, for they are based upon illusion. For they do not spring from the immediately present pleasure or pain, but only from the opening up of a new future which is anticipated in them. Only by borrowing from the future could pain or pleasure be heightened so abnormally, and consequently not enduringly. It would follow, from the hypothesis advanced, that a large part of the feeling of suffering and of well-being would be subjective and determined _a priori_, as is the case with knowing; and we may add the following remarks as evidence in favour of it. Human cheerfulness or dejection are manifestly not determined by external circumstances, such as wealth and position, for we see at least as many glad faces among the poor as among the rich. Further, the motives which induce suicide are so very different, that we can assign no motive that is so great as to bring it about, even with great probability, in every character, and few that would be so small that the like of them had never caused it. Now although the degree of our serenity or sadness is not at all times the same, yet, in consequence of this view, we shall not