"...whatever you want men to do to you, do also to them, this is the Law and the Prophets." (Matt 7)
This is it. It is simple, not easy. In every decision, in every move, in my words and thoughts, what do I want others to do, think, say on my behalf? It is how I should act, think and speak. This is love, this is life, this is it. No grand theological understanding needed. No papers that have to be written. This is it.