BG 18.32
The intellect which is enveloped in darkness, which regards immorality as righteousness and perceives all things contrary to what they are, is of an ignorant nature.
सर्वार्थान्विपरीतांश्च बुद्धिः सा पार्थ तामसी
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adharmaṁ — irreligion
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dharmam — religion
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iti — thus
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yā — which
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manyate — imagines
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tamasāvṛitā — shrouded in ignorance
tamasa-āvṛitā -
sarvārthān — all things
sarva-arthān -
viparītānśh — opposite
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cha — and
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buddhiḥ — intellect
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sā — that
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pārtha — Arjuna
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tāmasī — of the nature of ignorance
I will now explain to you the threefold division of reasoning and conviction, Arjuna. The pure intellect knows when to act and when to renounce. It knows what should be done and what should not. It can discriminate between fear and fearlessness, bondage and deliverance. The intellect which incorrectly understands righteousness and immorality, which cannot decide which action is proper and which is improper, is of a passionate nature. The intellect which is enveloped in darkness, which regards immorality as righteousness and perceives all things contrary to what they are, is of an ignorant nature.