The whole point is that, from a practical point of view, certain things have got to happen and certain things mustn’t happen. And really it’s much more important to see that the wrong thing doesn’t happen than to see that the right thing happens. We’re such creatures of habit that if the wrong thing is allowed to happen, a wrong habit is readily established. People make the mistake of believing that if they carry out an action somehow or another and it’s got a lot of mistakes in it, they’ll somehow be able to correct the mistakes later on. But Alexander used to say: “You never will.” So it’s important to take things very gradually, step by step, without any constraint of time. You’ve got to be prepared to carry out each bit of the procedure in such a way that the wrong thing doesn’t happen. It might take a lot of time, but really it takes the time it takes. You’re not going to get quicker results at the expense of making mistakes and getting things wrong, which is what people are very prone to do.
Walter Carrington (“Personally Speaking” – Part 3 p125)