BG 13.12

अध्यात्मज्ञाननित्यत्वं तत्त्वज्ञानार्थदर्शनम् / एतज् ज्ञानम् इति प्रोक्तम् अज्ञानं यद् अतोऽन्यत्

adhyātma-jñāna-nityatvaṃ tattva-jñānārtha-darśanam / etaj jñānam iti proktam ajñānaṃ yad ato'nyat

"Constant Self-enquiry + seeing the goal of true knowledge = THIS IS JÑĀNA; all else is ignorance."

All public-domain translations

4 translations · all pre-1928 or released to public domain · sources

Swami Swarupananda, Srimad Bhagavad Gita (1909)

[4]
Constant application to spiritual knowledge, understanding of the end of true knowledge: this is declared to be knowledge, and what is opposed to it is ignorance.

Sir Edwin Arnold, The Song Celestial (1885)

[7]
[Arnold full chapter text; verse closes the knowledge-qualities with the declaration 'this is jnana; what contradicts it is ignorance']

K.T. Telang, Sacred Books of the East Vol. 8 (1882)

[9]
Constant pursuit of self-knowledge, and the perception of the object of true knowledge, — all this is called knowledge; and that which is contrary to it is ignorance.

K.M. Ganguli, The Mahabharata, Bhishma Parva (1883–96)

[13]
Constant application to self-knowledge, and perception of the object of true knowledge, — this is declared to be knowledge; and what is otherwise than this is ignorance.