Constancy in the knowledge of the supreme Self (adhyātmajñāna), seeing the goal of the knowledge of truth (tattvajñāna); This is declared to be knowledge (jñāna), and whatever is otherwise is ignorance (ajñāna).
I shall teach you what is to be known; for knowing it, one attains immortality; it is called the supreme infinite spirit, beginningless, neither being nor nonbeing.
(11) constant attention to the wisdom that appertains to self, to see where knowledge of reality must lead, [all] this is ‘knowledge’, or so it has been said. Ignorance is what is otherwise than this.
13.12 Steadfastness in the knowledge of the Self, contemplation on the Goal of the knowledge of Reality-this is spoken of as Knowledge. Ignorance is that which is other than this.
13.12 Constant contemplation on the knowledge pertaining to the self, reflection for the attainment of knowledge of the truth --- this is declared to be knowledge, and what is contrary to it is ignorance.
13.12 Constancy in Self-knowledge, perception of the end of true knowledge -- this is declared to be knowledge, and what is opposed to it is ignorance.