Andrew Wiles Quotes
It's fine to work on any problem, so long as it generates interesting mathematics along the way - even if you don't solve it at the end of the day.
Wiles, Andrew. Interview. NOVA: The Proof. PBS, 28 Oct. 1997.
Although there are applied Mathematicians and Statisticians striving for utility of their work, most of the great breakthroughs, both practical and theoretical, have been made by the theoretical mathematicians.
Feynman generally emphasized the importance of a scientist understanding the mathematics of his/her subject, especially where nature's complexities abounded. At the time few appreciated the importance in the biological sciences of mathematics which we know today is so essential.
Sir Andrew John Wiles KBE FRS is an English mathematician and a Royal Society Research Professor at the University of Oxford, specializing in number theory. He is best known for proving Fermat's Last Theorem, for which he was awarded the 2016 Abel Prize and the 2017 Copley Medal by the Royal Society. He was appointed Knight Commander of the Order of the British Empire in 2000, and in 2018 was appointed as the first Regius Professor of Mathematics at Oxford. Wiles is also a 1997 MacArthur Fellow.