"What we do, as a conscious species, is set markers for ourselves. Once we reach one marker, we advance to the next."

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Just as a stream flows smoothly on as long as it encounters no obstruction, so the nature of man and animal is such that we never really notice or become conscious of what is agreeable to our will; if we are to notice something, our will has to have been thwarted, has to have experienced a shock of some kind.

— Arthur Schopenhauer