Bhagavad Gita 18.22

यत्तु कृत्स्नवदेकस्मिंकार्ये सक्तमहैतुकम् |
अतत्त्वार्थवदल्पं च तत्तमसमुदाहृतम्

Translation

That knowledge is said to be in the mode of ignorance where one is engrossed in a fragmental concept as if it encompasses the whole, and which is neither grounded in reason nor based on the truth.