y que dice que nada hay en el entendimiento que no haya estado antes en el sentido - René Descartes

For, occupied incessantly with the consideration of the limits prescribed to their power by nature, they [philosophers of former times] became so entirely convinced that nothing was at their disposal except their own thoughts, that this conviction was of itself sufficient to prevent their entertaining any desire of other objects; and over their thoughts they acquired a sway so absolute, that they had some ground on this account for esteeming themselves more rich and more powerful, more free and more happy, than other men who, whatever be the favors heaped on them by nature and fortune, if destitute of this philosophy, can never command the realization of all their desires.

The passions, then, can be defined as ‘perceptions, or sensations, or emotions of the soul that we refer (rapportons) particularly to the soul itself, and that are caused, sustained, and fortified by some movement of the spirits’ (§27).

Quo enim melius rem aliquam concipimus, eo magis determinati sumus ad eam unico modo exprimendam.