"Discipline — both mental and physical — is crucial."

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It's common to say that trees come from seeds. But how can a tiny seed create a huge tree? Seeds do not contain the resources need to grow a tree. These must come from the medium or environment within which the tree grows. But the seed does provide something that is crucial : a place where the whole of the tree starts to form. As resources such as water and nutrients are drawn in, the seed organizes the process that generates growth. In a sense, the seed is a gateway through which the future possibility of the living tree emerges.

— Peter Senge