yoga means literally 'yoking,' i.e., the disciplining of the instinctual forces of the psyche, which in Sanskrit are called kleshas. The yoking aims at controlling these forces that fetter human beings to the world.
Jung furnishes the foundational definition of kleshas within the depth-psychology corpus, rendering them as the instinctual psychic forces that yoga seeks to discipline, and explicitly equates them with Augustinian concupiscence.
, Psychology and Religion: West and East, 1958thesis