Send the following on WhatsApp
Continue to ChatI also require much time to ponder over the matters themselves, and particularly the principles of mechanics (as the very words: force, time, space, motion indicate) can occupy one severely enough; likewise, in mathematics, the meaning of imaginary quantities, of the infinitesimally small and infinitely large and similar matters. - Heinrich Hertz from https://whatsmyquote.com/quote/i-also-require-much-time-to-ponder-over-the-matters-themselves-and-particularly-the-principles-of-mechanics-as