Right in light there is darkness, but don't confront it as darkness. Right in darkness there is light, but don't see it as light. Light and dark are relative to one another like forward and backward steps. All things have their function. It is a matter of use in the appropriate situation.
Phenomena exist like box and cover joining.
Principle accords like arrow points meeting. Hearing the words you should understand the source. Don't make up standards on your own. Progress is not a matter of far or near, but if you are confused mountains and rivers block the way.