From Seth Godin
If you’re doing important work (and I’m hoping you are), then you owe it to your audience or your customers or your co-workers to learn everything you can. Feel free to ignore what you learn, but at least learn it.
Thankfully, it’s never too late to figure out what truly matters and learning absolutely everything you can about it. And in the world we live in, with an abundance of information at our fingertips, there’s just no excuse not to anymore.
You have to pick the things you really care about in life and learn them inside and out. Otherwise, you wont be much good to anyone and will most likely find yourself constantly looking back, wishing you had followed Seth’s advice.