Richard P. Feynman Quotes about Today

It is important to realize that in physics today, we have no knowledge of what energy is
Richard P. Feynman, Robert B. Leighton, Matthew Sands (2013). “The Feynman Lectures on Physics, vol. 1 for tablets”, Basic Books
I am not interested in what today's mathematicians find interesting.
Richard P. Feynman (2015). “The Quotable Feynman”, p.232, Princeton University Press