But the real fierceness of desire, the real heat of a passion long continued and withering up the soul of a man, is the craving for identity with the woman that he loves. He desires to see with the same eyes, to touch with the same sense of touch, to hear with the same ears, to lose his identity, to be enveloped, to be supported. For, whatever may be said of the relation of the sexes, there is no man who loves a woman that does not desire to come to her for the renewal of his courage, for the cutting asunder of his difficulties. And that will be the mainspring of his desire for her. We are all so afraid, we are all so alone, we all so need from the outside the assurance of our own worthiness to exist.

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).

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.

What you call passion is not a spiritual force, but friction between the soul and the outside world. Where passion dominates, that does not signify the presence of greater desire and ambition, but rather the misdirection of these qualities toward and isolated and false goal, with a consequent tension and sultriness in the atmosphere. Those who direct the maximum force of their desires toward the center, toward true being, toward perfection, seem quieter than the passionate souls because the flame of their fervor cannot always be seen. In argument, for example, they will not shout or wave their arms. But, I assure you, they are nevertheless, burning with subdued fires.

In the passion of love, for instance, a cause unknown to the
sufferer, but which is doubtless the spring-flood of hereditary
instincts accidentally let loose, suddenly checks the young
man's gayety, dispels his random curiosity, arrests perhaps his very breath; and when he looks for a cause to explain his
suspended faculties, he can find it only in the presence or image of another being, of whose character, possibly, he knows nothing and whose beauty may not be remarkable; yet
that image pursues him everywhere, and he is dominated by
an unaccustomed tragic earnestness and a new capacity for
suffering and joy.
If the passion be strong there is no previous interest or duty that
will be remembered before it; if it be lasting the whole life may
be reorganized by it, it may impose new habits, other manners,
and another religion.
Yet what is the root of all this idealism? An irrational instinct,
normally intermittent, such as all dumb creatures share, which
has here managed to dominate a human soul and to enlist all the
mental powers in its more or less permanent service, upsetting
their usual equilibrium.
This madness, however, inspires method; and for the first time,
perhaps, in his life, the man has something to live for.

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.

There is in fact a manly and legitimate passion for equality that spurs all men to wish to be strong and esteemed. This passion tends to elevate the lesser to the rank of the greater. But one also finds in the human heart a depraved taste for equality, which impels the weak to want to bring the strong down to their level, and which reduces men to preferring equality in servitude to inequality in freedom.

A man’s desire is for the woman, but the woman’s desire is rarely other than for the desire of the man.

"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."

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

With each new woman that a man is attracted to there appears to come a broadening of the outlook, or, if you like, an acquiring of new territory. A turn of the eyebrow, a tone of the voice, a queer characteristic gesture — all these things, and it is these things that cause to arise the passion of love.

Each human reality is at the same time a direct project to metamorphose its own For-itself into an In-itself-For-itself, a project of the appropriation of the world as a totality of being-in-itself, in the form of a fundamental quality. 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 is a feeling that follows action. It tends to be created or discovered, not predicted or planned. You don't find your passion. It finds you as you get in the mix and try things.

There is no absurdity or contradiction to which passion may not lead a man. When love or hate takes control, reason must submit and then discover justifications for their folly.