When I was a kid, my mother was pouring milk and she said to me, "Say when" and I had no idea what she meant by that, but as the milk rose, I just said, "When", and she stopped, so this began a lifetime of not knowing when to say when, because there is no marker about when to stop, so after much work and struggle, I found out that I can say stop at any time, and I think the sooner, the better for many things, and I found out that I don't have to say stop to many other things, so then up comes the other aspect of mind called the start mind, and that's a whole different animal altogether.