"As it turns out, that feeling of being lost or listless or never achieving your potential doesn't contain itself within any certain decade of life; it just lives in you until you learn how to cope with it or let it go."

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Never stop testing, and your advertising will never stop improving. Testing was used in advertising decades ago. The internet has made testing so easy that every online marketer can use it to improve advertising results. Google content experiment is a free tool for you to do split testing.

— David Ogilvy