Chapter 14 - Verse 13

अप्रकाशोऽप्रवृत्तिश्च प्रमादो मोह एव च ।
तमस्येतानि जायन्ते विवृद्धे कुरुनन्दन ॥ १३ ॥

aprakāśo’pravṛttiśca pramādo moha eva ca .
tamasyetāni jāyante vivṛddhe kurunandana .. 13 ..


Darkness, heedlessness, inertness, and error,—these arise when Tamas is predominant, O descendant of Kuru.
Read the commentary

Darkness: absence of discrimination. Inertness: Extreme inactivity, the result of darkness. Heedlessness and error are also the effects of darkness.

Life after death as governed by the gunas.

Whatever result is obtained after death,—even that is caused by attachment and desire and is all due to the gunas. This is taught as follows :