We would be able neither to remember nor to reflect nor to compare nor to think, indeed, we would not even be the person who we were a moment ago, if our concepts were divided among many and were not to be encountered somewhere together in their most exact combination.

The analysis of concepts is for the understanding nothing more than what the magnifying glass is for sight

Consciousness of myself, combined with complete ignorance of everything that does not fall within my sphere of thinking, is the most telling proof of my substantiality outside God, of my original existence

Reader! To whatever visible church, synagogue, or mosque you may belong! See if you do not find more true religion among the host of the excommunicated than among the far greater host who excommunicated them.

My religion recognizes no obligation to resolve doubt other than through rational means; and it commands no mere faith in eternal truths

You know how much I am inclined to explain all disputes among philosophical schools as merely verbal disputes or at least to derive them originally from verbal disputes

For a game it is too serious, for seriousness too much of a game.