Start with deceptively small things. Maybe it’s a bad idea to have really big ambitions initially, because the bigger your ambition, the longer it’s going to take, and the further you project into the future, the more likely you’ll get it wrong. Don’t try to construct the future like a building, because your current blueprint is almost certainly mistaken. Start with something you know works, and when you expand, expand westward.”

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Paul Graham, http://www.entrepreneur.com/article/228679