Just a few of my favs for now.
"Great wit, bad character." - Pensées, Blaise Pascal
"I have long since learned, as a measure of elementary hygiene, to be on guard when anyone quotes Pascal." - "Unity and Diversity of Europe," José Ortega y Gasset
"Moreover, it follows that moral inequality, authorized by positive right alone, is contrary to natural right whenever it is not combined in the same proportion with physical inequality: a distinction that is sufficient to determine what one should think in this regard about the sort of inequality that reigns among all civilized people, for it is obviously contrary to the law of nature, however it may be defined, for a child to command an old man, for an imbecile to lead a wise man, and for a handful of people to gorge themselves on superfluities while the starving multitude lacks necessities." - Jean-Jacques Rousseau, Discourse on the Origin of Inequality
"If you desire glory, you may envy Napoleon. But Napoleon envied Caesar, Caesar envied Alexander, and Alexander, I dare say, envied Hercules, who never existed. You cannot therefore get away from envy by means of success alone, for there will always be in history or legend some person even more successful than you are." - Bertrand Russell, The Conquest of Happiness 1930