Mahabharata Santi Parva Chapter 248:2

Mahabharata Santi Parva (Mokshadharma Parva) Chapter 248:2 Such a man never grieves, never rejoices, and is free from envy (at seeing another possessing a larger share of earthly objects). The Soul is incapable of being seen with the aid of the senses whose nature is to wander among all (earthly) objects of desire. Even righteous men, whose senses are pure, fail to behold the soul with their aid, what then should be said of the vicious whose senses are impure? When, however, a person, with the aid of his mind, tightly holds their reins, it is then that his Soul discovers itself like an object (unseen in darkness) appearing to the view in consequence of the light of a lamp. Indeed, as all things become visible when the darkness that envelopes them is dispelled, even the soul becomes visible when the darkness that covers it is removed. As an aquatic fowl, though moving on the water, is never drenched by that element, after the same manner the Yogin of freed soul is never soiled by the imperfections of the three attributes (of Sattwa, Rajas, and Tamas). After the same manner, the man of wisdom, by even enjoying all earthly objects without being attached to any of them, is never soiled by faults of any kind that arise in the case of others from such enjoyment. He who avoids acts after having done them duly, and takes delight in the one really existent entity, viz., the Soul, who has constituted himself the soul of all created beings, and who succeeds in keeping himself aloof from the three attributes, obtains an understanding and senses that are created by the Soul. The qualities are incapable of apprehending the Soul. The Soul, however, apprehends them always. The Soul is the witness that beholds the qualities and duly calls them up into being. Behold, this is the difference between the understanding and the Soul both of which are exceedingly subtile. One of them creates the qualities. The other never creates them. Though they are different from each other by nature, yet they are always united. The fish living in the water is different from the element in which it lives. But as the fish and the water forming its home are always united, after the same manner Sattwa and Kshetrajna exists in a state of union. The gnat born within a rotten fig is really not the fig but different from it. Nevertheless, as the gnat and the fig are seen to be united with each other, even so are Sattwa and Kshetrajna. As the blade in a clump of grass, though distinct from the clump, nevertheless exists in a state of union with it, even so these two, though different from each other, each existing in its own self, are to be seen in a state of constant union.'