Changes

Witness means an observer, someone who looks on and does not act himself. So, when the mind is very quiet, one can withdraw a little in this way from circumstances and look at things as though he were a witness, a spectator, and not participating in the action himself. This gives you a great detachment, a great quietude, and also a very precise see of the value of things, because it cuts the attachment to action. When you know how to do this with yourself, when you can withdraw and watch yourself acting, you learn many things about yourself. When you are all mixed up and take part in the action, you do not observe yourself acting, you don't know what you are like. But when you draw back and look at yourself, you can perceive many imperfections which you wouldn't have seen otherwise.

<ref>https://incarnateword.in/cwm/06/13-october-1954#p2</ref>