If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing. ↗
Fear nothing but what thy industry may prevent; be confident of nothing but what fortune cannot defeat; it is no less folly to fear what is impossible to be avoided than to be secure when there is a possibility to be deprived. ↗
It's just impossible to ignore the activists in your party. These are the people who stuff the envelopes, and walk the precincts, and make the telephone calls, and do all the so-called grunt work that brings about a successful campaign. ↗