One of my favourite quotes, though relatively unknown is: "If we can only accept what we currently believe, we have already reached our full potential." Although if we were to be a little more philosophical about it, we'd modify it so that it's a question, so we can all discuss! Philosophical unity!

If we can only accept what we currently believe, have we have already reached our full potential?

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.