Bernoulli's Principle
"It would be better for the true physics if there were no mathematicians on earth. "

                                                                                               — Daniel Bernoulli
                                                                                               Quoted in The Mathematical Intelligencer (1991), 13

"The determination of the value of an item must not be based on its price, but rather on the utility it yields. The price of the item is dependent only on the thing itself and is equal for everyone; the utility, however, is dependent on the particular circumstances of the person making the estimate. Thus there is no doubt that a gain of one thousand ducats is more significant to a pauper than to a rich man though both gain the same amount. "

                                                                      — Daniel Bernoulli
                                                                     Exposition of a New Theory on the Measurement of Risk (1738), 24. 

"There is no philosophy which is not founded upon knowledge of the phenomena, but to get any profit from this knowledge it is absolutely necessary to be a mathematician." 

                                                                                  — Daniel Bernoulli
                                                                                 Quoted in C. Truesdell, Essays in the History of Mathematics.