A language that doesn't affect the way you think about programming, is not worth knowing.
In the age of big data, the mathematical principles of data structures and algorithms have become more critical than ever.
I strongly believe that missionaries make better products. They care more. For a missionary, it's not just about the business. There has to be a business, and the business has to make sense, but that's not why you do it. You do it because you have something meaningful that motivates you.