De Abrahamo

For these in some degree are sovereigns and rulers, having acquired a certain power over us, but not all to an equal extent; for the five are subordinate to the four, and are compelled to pay them taxes and tribute, such as are appointed by nature.

For it is from the things which we see, or hear, or smell, or taste, or touch, that pleasures, and pains, and fears, and desires arise; as there is no one of the passions which has any power to exist of itself, if it were not supplied by the materials furnished by the outward senses.

For it is in these things that their powers consist, either in figures and in colours, or in the faculty of speaking or hearing which depends on the voice, or in flavours, or in odours, or by the subjects of touch, whether they are soft or hard, or rough, or smooth, or hot, or cold. For all these things are supplied to each of the passions by means of the outward senses.

And as long as the taxes before-mentioned are paid, the alliance among the kings remains; but when they are no longer contributed, as they were before, then immediately do quarrels and wars arise. And this appears to happen when painful old age supervenes, in which none of the passions becomes weaker, but rather perhaps stronger than their ancient power; but the sight becomes dim, and the ears hard of hearing, and every one of the other outward senses more blunt, being no longer equally able as before to judge and decide accurately of every subject submitted to them, nor any longer to pay a tribute which will be equal to the number of the passions. So that it happened very naturally that they being thoroughly exhausted and laid prostrate by them were easily put to flight by the adverse passions;