BG 18.22
यत्तु कृत्स्नवदेकस्मिन्कार्ये सक्तमहैतुकम् ।
अतत्त्वार्थवदल्पं च तत्तामसमुदाहृतम् ॥
अतत्त्वार्थवदल्पं च तत्तामसमुदाहृतम् ॥
yat tu kṛtsna-vad ekasmin kārye saktam ahaitukam
atattvārtha-vad alpaṁ ca tat tāmasam udāhṛtam
atattvārtha-vad alpaṁ ca tat tāmasam udāhṛtam
Word-for-word meanings
tat — that [knowledge]; tu — however; yat — which; saktam — clings; ekasmin — to a single; kārye — object or act; kṛtsna-vat — as if it were everything; ahaitukam — which is irrational; atattva-artha-vat — devoid of essential truth; ca — and; alpam — trivial; udāhṛtam — is said; tāmasam — to be tāmasika.
Translation
That knowledge, however, which clings to a single object or act as if it were the all-in-all, which is irrational, devoid of essential truth, and trivial, is said to be tāmasika.