It seems that the influence of your teacher has been to give you a false idea of what are the worthwhile problems. The worthwhile problems are the ones you can really solve or help solve, the ones you can really contribute something to. A problem is grand in science if it lies before us unsolved and we see some way for us to make a little headway into it.
—Richard Feynman. “Letter to Koichi Mano, 3 Feb 1966.” Perfectly Reasonable Deviations from the Beaten Track.