Buy books liberally
I'm a huge cheapskate but I allow myself total, reckless freedom to purchase books. I buy any book that seems interesting, any book that challenges a deeply-held belief, and any book that is mentioned by someone I respect.
Books are condensed human knowledge and experience. When so much of life is striving to understand how things work, it seems only sensible to learn from others before expending vast amounts of energy through trial-and-error.
Books are also absurdly, comically cheap. At worst, they offer several hours of entertainment; at most, they contain ideas that can completey transform the trajectory of your life (and the lives of those around you).
I buy books faster than I can read them, and see no issue therein. I aspire to build a library, a place of inspiration and possibility that can cater to my wife's interests, my friends', my childrens'. There is something both humbling and enticing about a room full of unread books (what Taleb calls the antilibrary): a reminder that there are always more ideas to explored, and that your next great idea is only a few pages away, if only you know where to look.
Perhaps most importantly, it's also fun to allow yourself an area of no-holds-barred indulgence.
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