The beauty of physics lies in its ability to explain the universe with a few simple principles.

Life lessons will be presented to you in the order they are needed. Everything you need to master the lesson is within you. Once you have truly learned a lesson， you will be presented with the next one. If you are alive， that means you still have lessons to learn.

释义：舌是造成利益或祸害的根本，口是福气祸事之门。