These are simply a few quotes I pulled from his 1921 book Psychological types. I'm not sharing these with any intent to suggest that his description of Se is somehow better than our usual understanding of it. I just found it interesting to compare and contrast the vibe with how Socionics treats it.

I'm afraid the source I pulled this from was full of typos due to the scan quality. There's still a lot probably, but I think I fixed some of the more egregious ones.

"As sense perception, sensation is naturally dependent upon the object. But, just as naturally, it is also dependent upon the subject; hence, there is also a subjective sensation, which after its kind is entirely different from the objective."


"...everything is seen or heard to the farthest physiological possibility, but not everything attains that threshold value which a perception must possess in order to be also apperceived. It is a different matter when sensation itself possesses priority, instead of merely seconding another function. In this case, no element of objective sensation is excluded and nothing repressed (with the exception of the subjective share already mentioned). Sensation has a preferential objective determination, and those objects which release the strongest sensation are decisive for the individual's psychology. The result of this is a pronounced sensuous hold to the object."


"As a function its sole criterion of value is the strength of the sensation as conditioned by its objective qualities."


"It is, however, only concrete, sensuously perceived objects or processes which excite sensations in the extraverted attitude; exclusively those, in fact, which everyone in all times and places would sense as concrete. Hence, the orientation of such an individual corresponds with purely concrete reality. The judging, rational functions are subordinated to the concrete facts of sensation, and, accordingly, possess the qualities of inferior differentiation, i.e. they are marked by a certain negativity, with infantile and archaic tendencies. The function most affected by the repression, is, naturally, the one standing opposite to sensation, viz. intuition, the function of unconscious perception."


7. The Extraverted Sensation Type


"No other human type can equal the extraverted sensation-type in realism. His sense for objective facts is extraordinarily developed. His life is an accumulation of actual experience with concrete objects, and the more pronounced he is, the less use does he make of his experience. In certain cases the events of his life hardly deserve the name 'experience'. He knows no better use for this sensed 'experience' than to make it serve as a guide to fresh sensations; anything in the least 'new' that comes within his circle of interest is forthwith turned to a sensational account and is made to serve this end."


"Such a type -- the majority arc men apparently -- does not, of course, believe himself to be 'subject' to sensation. He would be much more inclined to ridicule this view as altogether inconclusive, since, from his standpoint, sensation is the concrete manifestation of life -- it is simply the fulness [sic] of actual living. His aim is concrete enjoyment, and his morality is similarly orientated. For true enjoyment has its own special morality, its own moderation and lawfulness, its own unselfishness and devotedness. It by no means follows that he is just sensual or gross, for he may differentiate his sensation to the finest pitch of æsthetic purity without being the least unfaithful, even in his most abstract sensations, to his principle of objective sensation."


"Upon the lower levels this is the man of tangible reality, with little tendency either for reflection or commanding purpose. To sense the object, to have and if possible to enjoy sensations, is his constant motive. He is by no means unlovable; on the contrary, he frequently has a charming and lively capacity for enjoyment; he is sometimes a jolly fellow, and often a refined æsthete."


"...conjectures that transcend or go beyond the concrete are only permitted on condition that they enhance sensation."


"He will, without hesitation, relate an obvious psychogenic symptom to the falling barometer, while the existence of a psychic conflict seems to him a fantastic abnormality. His love is incontestably rooted in the manifest attractions of the object. In so far as he is normal, he is conspicuously adjusted to positive reality -- conspicuously, because his adjustment is always visible."


"He dresses well, according to his circumstances ; he keeps a good table for his friends, who are either made comfortable or at least given to understand that his fastidious taste is obliged to impose certain claims upon his entourage."


"But the more sensation predominates, so that the sensing subject disappears behind the sensation, the more unsatisfactory does this type become."


"Although the object is entirely indispensable to him, yet, as something existing in and through itself, it is none the less depreciated. It is ruthlessly violated and essentially ignored, since now its sole use is to stimulate sensation."


"But, above all, the repressed intuitions begin to assert themselves in the form of projections upon the object. The strangest conjectures arise; in the case of a sexual object, jealous phantasies and anxiety-states play a great role. More acute cases develop every sort of phobia, and especially compulsive symptoms. The pathological contents have a remarkable air of unreality, with a frequent moral or religious colouring. A pettifogging captiousness often develops, or an absurdly scrupulous morality coupled with a primitive, superstitious and 'magical' religiosity, harking back to abstruse rites."


"When he becomes neurotic, he is much harder to treat in the rational way, because the functions to which the physician must appeal are in a relatively undifferentiated state; hence little or no trust can be placed in them. Special means of bringing emotional pressure to bear are often needed to make him at all conscious."