One of the reasons I love reading the preface of any book is that many authors include quotations that are relevant to the book they’re writing. This one is from my Calculus book by James Stewart. I like it because it captures a large chunk of the reason why I like the job I’m in.
A great discovery solves a great problem but there is a grain of discovery in the solution of any problem. Your problem may be modest; but if it challenges your curiosity and brings into play your inventive faculties, and if you solve it by your own means, you may experience the tension and enjoy the triump of discovery. – George Pólya