When your mind is directed outward, you lose power in your tanden. When your effort is concentrated inward, you have power within yourself, and everything becomes a part of your hara. If you hear a bell from outside, that sound at the same time arises from your hara or tanden. So, the sound does not come from outside. It comes rather from inside, and you hear your own sound. Nothing exists outside of yourself because your mind covers everything. So, whatever you do, that is your own activity. There is no duality in your activity.
—cuke.com/ig for links to the source of the image. Excerpt from Shunryu Suzuki lecture 67-12-04-A as found on shunryusuzuki.com, edited by PF. Go to instagram.com/cuke_archives for the Instagram version.