Contemporary scholarly and practical interpretations for modern seekers.
Swami Chinmayananda
# BG 13.18 — Translation of Meaning
Brahman is that singular consciousness-light through which all intellectual knowledge, inner wisdom, and direct experience are illuminated. It is because of this that we become aware of our diverse forms of knowledge and experience. Therefore, it is compared to light or radiance. Merely having eyes before external objects does not grant us their vision; rather, those objects must also be illuminated by some external light. Taking this worldly experience as an analogy, we must also acknowledge that there must be some inner light that illuminates our internal feelings and thoughts; otherwise, we could not be aware of these mental movements at all. This illuminator of the mind's movements is itself called self-luminous consciousness, or the light of the atman. To call this consciousness light or radiance is the tradition of spiritual scripture.
In the early stages of Vedanta study, seekers unfamiliar with scriptural language understand the word "light" merely as worldly light. But this understanding is not true, for worldly light falls within the category of objects perceived, whereas the atman is the witness of all. Therefore, perceived light cannot be the atman, nor can the atman be like such light. Thus, it becomes necessary for the teacher to clarify the true meaning of terms like "self-light" or "the light of the atman."
To point to the witness beyond all lights, one must first negate the entire realm of perceived objects—proving they are not the atman. The sources of light we know—the sun, moon, stars, lightning, and fire—none possess the capacity to illuminate the atman. Before it, they all become dim. Therefore, Lord Krishna calls that atman the light of all lights, which illuminates even all worldly luminous objects. We would not even be aware of the sun itself, which is called self-luminous, if the principle of consciousness were not illuminating it. We are affected by the world's pleasure and pain only when we are aware of them, and this awareness is possible only through the light of consciousness. Therefore, consciousness is called the illuminator of the entire realm of perceived objects.
It is beyond darkness. Despite such clear explanation, because the conditioning of worldly light-knowledge is deeply rooted in the disciple's intellect, he still grasps it as a relative concept of light. We know and understand external light only as opposed to darkness. For the sun, the word "light" has no meaning, for the sun does not even know darkness. Therefore, to point to the ultimate conscious nature of the atman, it is said here that it is beyond even the concept of darkness.
This light of consciousness is so subtle that it illuminates both light and darkness. It has no opposition with anything. This statement of the Lord may also mean that the atman is that light which illuminates both the knowledge (light) and ignorance (darkness) movements of the inner instrument, yet it itself remains untouched by both.
In the second line of this verse, through three words—knowledge, the knowable, and that which is to be known—the atman or Brahman itself is indicated. That Brahman is knowledge, meaning it is consciousness itself. Brahman alone is the knowable object worthy of knowing, for through its knowledge alone can liberation from the world be attained. This Brahman is that which is to be known—it is experientially accessible through a pure inner instrument endowed with qualities like humility.
It dwells in the heart of all. If there exists such an infinite conscious principle that is the illuminator of all and without which life has no existence whatsoever, then surely it is worthy of knowing. Attaining it can be the goal of our life. Where should we search for it? To which pilgrimage should we journey? Are we capable of such an adventurous quest? Generally, people ask such questions, which reveals that they understand the atman as something separate from themselves, something to be attained in some distant place or future time. To dispel all such contrary notions, a clear and bold proclamation is made here: that infinite Supreme Self dwells in the heart of all.
From a philosophical perspective, the word "heart" means the pure mind, which is considered the source of all ideals and sacred sentiments. In this atmosphere of inner purity, when the intellect meditates upon that ultimate principle of the atman—which, though transcendent, is also all-pervading—it itself becomes atman-like. This is self-realization. Therefore, the heart is considered the dwelling place of the atman. The experience of the atman dwelling in one's own heart is the experience of infinite Brahman, for the atman is Brahman.
Concluding this section, the Lord speaks...
This interpretation draws on a specific tradition and may not represent the view of any single school. For authoritative guidance within a specific tradition, seek a qualified teacher.