The erudite conversation between Devi Devhuti and her son Lord Kapil is described in detail in Shrimad Bhagwat MahaPuran.
It starts in the 25th chapter of Third Skandh and goes upto the last chapter of that Skandh, i.e. 33rd.
Lord always makes it a point, whenever He gets a chance, to describe Vedic conclusions in the simplest terms possible, so that even the most moronic person can understand them easily. This dialogue between mother-son duo is another such example of Lord's benevolence towards his eternal chaitanya power Jeevatma.
Many such well known conversations are there. For example, in Shri Bhagwat Puran itself, in its 11th Skandh, while talking to His beloved devotee Uddhav, Lord has described so many concepts in such a straight-forward manner, that's there's no scope for any confusion. This conversation between Shri Krishna and Uddhav starts in the 6th chapter of 11th Skandh and goes all the way upto 29th. So a lot of things have been described by Lord there. Of course, after having read the extremely sweet and dulcet description of some of the activities of Divine Vrindavan and divine kunj in the 10th Skandh, not many devotees are too concerned about reading all those vedic summaries, and that's understandable.
However, when it comes to the most focused and sharp and riveting summary of Vedas given by the Lord, nothing can ever come anywhere close to Shri Bhagvad Gita.
But I'll stick my neck out and say that while Shri Bhagvad Gita is truly beyond any comparison when it comes to its focus and completeness and it's entirety and its breadth of knowledge that Lord Krishna gives to all of us via Arjun, the EASIEST TO UNDERSTAND Vedic summaries are to be found in Goswami Tulsidas' Shri Ram Charit Manas. That's what I truly feel.
Hell man, this post is going God knows where. Ok bye. 😊