In the different wisdom traditions we find attempts to reduce down to their simplest all of the instructions about living a full life: What is the essence of practice? What leads to true contentment?  We can see that is this tale from the Jewish  tradition, which resembles the simple direct presentation of wisdom found in the Christian Desert Fathers and in the Zen tradition. We are told that a man approached Rabbi Hillel and promised to convert to Judaism if the Rabbi managed to recite the whole of the Jewish teaching, while standing on one leg. Rabbi Hillel stood on one leg and said simply: That which is hateful to you, do not do that to your neighbour. That is the essence of the Law. Everything else is just a Commentary. Go and Study it.