The origin of our passions, the root and spring of all the rest, the only one which is born with man, which never leaves him as long as he lives, is self-love; this passion is primitive, instinctive, it precedes all the rest, which are in a sense only modifications of it.

The growth of a passion is a very peculiar thing. In highly
organized intellectual and artistic types it is so often apt to
begin with keen appreciation of certain qualities, modified by
many, many mental reservations. The egoist, the intellectual,
gives but little of himself and asks much. Nevertheless, the
lover of life, male or female, finding himself or herself in
sympathetic accord with such a nature, is apt to gain much.

If the definition of insanity is trying the same thing over and over and expecting different results, then passion is a form of mental retardation- deliberately blunting our most critical cognitive functions.

There is a Passion natural to the Mind of man, especially a free Man, which renders him impatient of Restraint.

Every human reality is a passion in that it projects losing itself so as to found being and by the same stroke to constitute the In-itself which escapes contingency by being its own foundation, the Ens causa sui,
which religions call God. Thus the passion of man is the reverse of that of Christ, for man loses himself as man in order that God may be born. But the idea of God is contradictory and we lose ourselves in vain. Man is a useless passion.

passion governed by reason

It's not at all uncommon to find a person's desires compelling him to go against his reason, and to see him cursing himself and venting his passion on the source of the compulsion within him. It's as if there were two warring factions, with passion fighting on the side of reason. But I'm sure you won't claim that you had ever, in yourself or in anyone else, met a case of passion siding with his desires against the rational mind, when the rational mind prohibits resistance.

My passions, when roused, are intense, and, so long as I am activated by them, nothing equals my impetuosity. I no longer know moderation, respect, fear, propriety; I am cynical, brazen, violent, fearless; no sense of shame deters me, no danger alarms me. Except for the object of my passion, the whole world is as nothing to me; but this only lasts for a moment, and the next I am plunged into utter dejection.

"In suffocating the voice of conscience, passion carries with itself a restlessness of the body and the senses: it is the restlessness of the "external man." When the internal man has been reduced to silence, then passion, once it has been given freedom of action, so to speak, exhibits itself as an insistent tendency to satisfy the senses and the body."

The capacity of passion is both cruel and divine

Passion often makes a madman of the cleverest man, and renders the greatest fools clever.

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).

Passion is not friendly. It is arrogant,
superbly contemptuous of all that is not
itself, and, as they very definition of passion
implies the impulse to freedom, it has a might
intimidiating power. It contains a challenge.
It contains an unspeakable hope.

Man did not give himself the taste for the infinite and the love of what is immortal. These sublime instincts are not born of a caprice of his will; they have their immovable foundations in his nature; they exist despite his efforts. He can hinder or deform them, but not destroy them. The soul has needs that must be satisfied; and whatever care one takes to distract it from itself, it soon becomes bored, restive, and agitated.