तमस् त्व् अज्ञानजं विद्धि मोहनं सर्वदेहिनाम् । प्रमादालस्यनिद्राभिस् तन् निबध्नाति भारत ॥

tamas tv ajñāna-jaṃ viddhi mohanaṃ sarva-dehinām | pramādālasya-nidrābhis tan nibadhnāti bhārata ||

Tamas — born of ignorance — deludes all beings and binds through carelessness, laziness, and sleep.

Word by word (3)
tamas tu ajñāna-jam viddhi
— know tamas to be born of ignorance (ajñāna-ja = born of ajñāna); the most fundamental guṇa, rooted in nescience
mohanam sarva-dehinām
— it deludes (mohana = causing delusion/stupefaction) all embodied beings (sarva-dehinām — no exception)
pramāda-ālasya-nidrābhiḥ nibadhnāti bhārata
— it binds through pramāda (heedlessness/recklessness), ālasya (laziness/indolence), and nidrā (sleep/torpor) — O Bharata

Know tamas to be born of ignorance (ajñāna). It deludes all embodied beings. It binds fast, O Bharata, through heedlessness (pramāda), indolence (ālasya), and sleep (nidrā).

A modern analogy

Tamas is the deepest sleep of the soul. Unlike rajas (which is restlessly awake) or sattva (which is peacefully awake), tamas is like sedation: the person acts, but without awareness; lives, but without real wakefulness. Depression, addictions, chronic procrastination — these are tamas working in the mind.

Tamas is the densest and darkest of the three guṇas — it literally obscures the inner light (as the dense cloud obscures the sun). Unlike sattva (binding through pleasure) or rajas (binding through activity), tamas binds through its opposite: a thick inertia that prevents action, awareness, and discrimination. Its three instruments — pramāda, ālasya, nidrā — are the specific psychological states of a tamas-dominated mind.

ajñāna-jam is the deepest binding: tamas doesn't merely delude about objects (as rajas does by misvaluing them), it deludes about the nature of reality itself. A tamas-bound person doesn't even recognize the guṇas at work — they simply LIVE the delusion as if it were normal. Hence 'mohanaṃ sarva-dehinām' (deludes ALL beings) — tamas is the default state that the other two guṇas are trying to overcome. In the 14-step ladder: tamas → rajas → sattva → guṇātīta.

Public-domain translations (4) compare all →

But, know thou Tamas to be born of unwisdom, deluding all embodied beings; by heedlessness, indolence and sloth, it binds fast, O Bharata. [1]

And know Tamas to be born of ignorance, stupefying all embodied beings; it binds fast, O descendant of Bharata, by miscomprehension, indolence, and sleep. [4]

Darkness, know, is born of ignorance, and deludes all embodied beings. That binds by carelessness and indolence and sleep, O descendant of Bharata! [9]

Darkness, however, know, is born of ignorance, and bewilders all embodied soul. That binds, O Bharata, by error, indolence, and sleep. [13]

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