Boundaries are actually the main factor in space, just as the present, another boundary, is the main factor in time.

In my work, I have never had any use for anything that I have known in advance.

Nobody can teach what is inside a person; it has to be discovered for oneself and a way must be found to express it.

No one can teach that which is inside another, each person must find it on his own and find a way to express it.

What comes from oneself is nearly from no one. There is only me as a link.

Whatever I know how to do, I've already done. Therefore I must always do what I do not know how to do.

One can never know enough. The unknown and its call lies even in what we know.