'Markets can stay irrational longer than you can remain solvent.'
- Some other hoity toity British Lord
Context
That quote is from Sir John Maynard Keynes, a seminal figure in 20th century economics.
Sir Isaac Newton, after independently inventing calculus, revolutionizing physics and astronomy... was actually the Master and Warden of the Royal Mint, and was thus essentially in charge of English monetary policy during the early 1700's.
Yes, Newton was in charge of the English Mint, the actual Master of Coin... when he made these investments pictured in the image.