This video (by https://bhagavadgitareader.wordpress.com and http://sanskritstudio.wordpress.com) discusses, in four parts, the core ideas of Bhagavad-gita verse 4.7 (Chapter 4, Verse 7).
This video is one of four videos. Part 1 starts with a very small sentence to capture the main idea of the verse, and then the rest of the videos (parts 2-4) gradually expand this sentence into longer sentences, where additional ideas are incorporated.
The idea is that this gradual approach will help students not only to understand the true message of the unadulterated Gita, but also to give some pointers about Sanskrit usage and grammar along the way. And it is also hoped that this “core idea”, as expressed in the first video, will help Gita students with their memorization of this verse.
A Bhagavad-gita Reader 