In the seventh chapter of the Bhagavad-gita, Shri Krishna helps Arjuna think whether it is possible for a finite and limited mind to comprehend and embrace the concept of infinity.
The Lord begins by deconstructing Himself and His nature as the very essence of the world. He goes on to explain what prevents people from realising this – the delusion of the three gunas or qualities – Sattva, Rajas and Tamas. He concludes by listing out the ways one can be virtuous and which is the best among them; the one that can accomplish the task of realising His true nature.
In short, Shri Krishna, in this chapter, goes on to give that knowledge, knowing which nothing more needs to be known.