It is certain that Pascal never passed a day without suffering, and hardly knew what sleep was (Nietzsche's case was the same); it is also certain th… - Lev Shestov

Suppose Euripides is right, and that indeed no one can be sure whether life is not death and death life; can this truth ever become certain? If all men daily repeated Euripides’ words when they got up and when they went to bed, they would remain as strange and as problematic as on the day when the poet first heard them in the depths of his soul. P. 6

When "the light of truth" appeared to Descartes, he immediately imprisoned his discovery within a logical formula: "Cogito, ergo sum." And the great truth perished, it gave nothing either to Descartes or to any one else. Yet it was he himself who taught: "De omnibus dubitandum." But then he ought first of all to have questioned the legitimacy of the pretensions of syllogistical formulae, which claim to be the only, invariable, expert appraisers of truth and error. Directly Descartes began to make deductions he forgot what he had seen. He forgot the cogito, he forgot the sum, in order to be sure of the ergo which has the power to constrain men's minds. p. 110

Plato, too, knew the “underground”, but her called it a “cave” and created his splendid world-famous myth in which men were likened to prisoners in a cave. But he did it in such a way that no one thought of calling Plato’s cave “underground” nor calling Plato himself a sickly, abnormal being, one of those for whom normal men have to invent theories, treatments, etc. p. 13