Soul—the eternal living entity, who is the marginal energy, eternally part and parcel of the Supreme Lord; Known in Sanskrit as jīva, jīva-ātmā or ātmā, the soul is the eternal individual self, who is a tiny particle of Lord Kṛṣṇa's spiritual potency located in the heart of the material body. The symptom of the soul is consciousness, and the power of the soul is taṭastha-śakti, the power of choice. Thus the soul is responsible for his liberation or bondage, though he has no power to either liberate himself or enjoy matter. The result of his choice, whether auspicious or inauspicious, is arranged by the Supersoul. As the air is always different from the smells it carries, so the soul is always different from the material designations it assumes due to the influence of the modes of nature. How a yogī perceives the soul's direct relationship with the Supreme Soul is described in SB 11.14.45: He sees the individual souls united with the Supreme Soul, just as one sees the sun's rays completely united with the sun. The sun is jyotiṣi, the source of light. Similarly, Kṛṣṇa, the Supreme Soul, is the source of the light of consciousness of all living entities. Sunlight is composed of photons, which are tiny units of light. Similarly, each individual soul (jīva-ātmā) is a tiny unit of consciousness. See Consciousness, Ecstasy, Modes of nature, Supersoul.