तमस्त्वज्ञानजं विद्धि मोहनं सर्वदेहिनाम्।
।।14.8।।हे भरतवंशी अर्जुन सम्पूर्ण देहधारियोंको मोहित करनेवाले तमोगुणको तुम अज्ञानसे उत्पन्न होनेवाला समझो। वह प्रमाद? आलस्य और निद्राके द्वारा देहधारियोंको बाँधता है।
Lord Krishna describes the word ajnana meaning ignorance which is the antithesis of wisdom. The word jnana meaning knowledge is the precise, accurate perception whereas ajnana is the perverted, inaccurate perception. The word tamas means darkness denoting the darkness of ignorance and is diametrically opposite to the light of knowledge. The word mohanam is that which deludes into illusion and the darkness of ignorance. This tamas is also the cause of pramada or madness and listlessness which is the inability to focus having a fragmented attention span. It is also the cause of alasya or indolence slothlike laziness which is the inability to properly execute any endeavor properly and nidrabhih or sleep is the disinclination of the senses to function terminating all activities. All these things nibadhanti or binds one to the material existence without reprieve.The sublation of the external senses constitutes the dream state;but when the mind is also sublated then the dream state becomes sleep.