Eros is desire, longing, force, exuberance, pleasure, suffering. Where Logos is ordering and insistence, Eros is dissolution and movement. They are two fundamental psychic powers that form a pair of opposites, each one requiring the other.
— Carl Gustav Jung
Desire, in Jung's account here, is not a problem to be solved but one half of a necessary tension. Logos orders, insists, holds shape — and the soul needs that. But Eros dissolves and moves, and the soul needs that too. Neither pole is the healthy one. The error runs so deep in the Western inheritance that it barely registers as an error: we reach for ordering, for insistence, for clarity, for the upward arc — and we call that maturity, or discipline, or even spiritual development. What we are doing is choosing one side of a pair that only works as a pair.
Notice what Jung includes in Eros: pleasure and suffering together, without hierarchy. This is the detail that resists. Most of what gets sold as inner work promises to increase the pleasure and reduce the suffering — to tip the Eros-ratio toward the bearable. But longing contains both terms simultaneously, and any practice that promises to separate them is not working with Eros at all. It is substituting a managed facsimile — desire with the suffering extracted — which is no longer desire but its ghost, orbiting an absence it cannot name.
Carl Gustav Jung·The Red Book: Liber Novus·2009