So it is the human condition that to wish for the greatness of one's fatherland is to wish evil to one's neighbors. The citizen of the universe would be the man who wishes his country never to be either greater or smaller, richer or poorer.
If God did not exist, it would be necessary to invent him; let us worship God through Jesus if we must - if ignorance has so far prevailed that this name can still be spoken in all seriousness without being taken as a synonym for rapine and carnage. Every sensible man, every honourable man, must hold the Christian sect in horror.
The wicked can have only accomplices, the voluptuous have companions in debauchery, self-seekers have associates, the politic assemble the factions, the typical idler has connections, princes have courtiers. Only the virtuous have friends.
Descartes constructed as noble a road of science, from the point at which he found geometry to that to which he carried it, as Newton himself did after him. ... He carried this spirit of geometry and invention into optics, which under him became a completely new art.