All events are linked together in the best of possible worlds; after all, if you had not been driven from a fine castle by being kicked in the backside for love of Miss Cunegonde, if you hadn't been sent before the Inquisition, if you hadn't traveled across America on foot, if you hadn't given a good sword thrust to the baron, if you hadn't lost all your sheep from the good land of Eldorado, you wouldn't be sitting here eating candied citron and pistachios. - That is very well put, said Candide, but we must cultivate our garden.
VoltaireThis self-love is the instrument of our preservation; it resembles the provision for the perpetuity of mankind: it is necessary, it is dear to us, it gives us pleasure, and we must conceal it.
VoltaireDescartes 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.
Voltaire