Bhagavad Gita, Chapter 9, Verse 1

The Deity said: To you, who do not carp, verily shall I now declare this, the most profound knowledge, united with realisation, having known which, you shall be free from evil (Samsâra).

A real, specific quality gets named as the reason this teaching is offered now, not random timing.

Krishna ties this deeper teaching directly to Arjuna's own real character, his freedom from envy, rather than treating the moment as arbitrary. Real receptivity is described as the actual precondition for real depth.