To understand via the heart is not to understand.

Arts and sciences are not cast in a mould, but are found and perfected by degrees, by often handling and polishing.

Water, earth, air, fire, and the other parts of this structure of mine are no more instruments of your life than instruments of your death. Why do you fear your last day? It contributes no more to your death than each of the others. The last step does not cause the fatigue, but reveals it. All days travel toward death, the last one reaches it.

If there is such a thing as a good marriage, it is because it resembles friendship rather than love.

Their [the Skeptics'] way of speaking is: "I settle nothing. . . . I do not understand it. . . . Nothing seems true that may not seem false." Their sacramental word is . . . , which is to say, I suspend my judgment.

No one but yourself knows whether you are cowardly and cruel, or loyal and devout; others do not see you; they surmise you by uncertain conjectures; they perceive not so much your nature as your art.

Now, since our condition accommodates things to itself, and transforms them according to itself, we no longer know things in their reality; for nothing comes to us that is not altered and falsified by our Senses. When the compass, the square, and the rule are untrue, all the calculations drawn from them, all the buildings erected by their measure, are of necessity also defective and out of plumb. The uncertainty of our senses renders uncertain everything that they produce.