If you feel like you have known it all, you don’t really know.
Empty your mind like an empty cup, and feel the warmth and fragrance of the tea poured in.
“When you understand all things
can you step back from your own understanding?”
Lao Tzu Tao Te Ching Chapter 10, translated by JH McDonald
If you want to really known something, surrender the idea that you can know it all.