. . . on the nature of mind in za-zen: "When you practice sitting in a very contented way, for many years, your understanding about mind and body changes. In our ordinary way, we usually separate this mind and body. Maybe invisible quality of human experience we may say is 'mind,' and visible quality of same thing we may call 'body.' When, year after year, your understanding about body and mind become more precise, you understand that two actually are same thing. . . . Physically you feel that there is no division between this physical body and air, maybe earth and solar systems. There is no . . . there is distinction but there is no division between you and things. All are one piece of great happening."