In everything one thing is impossible: rationality.

He divines remedies against injuries; he knows how to turn serious accidents to his own advantage; whatever does not kill him makes him stronger

[Heraclitus had] a regal air of certainty.

People live for the morrow, because the day-after-to-morrow is doubtful.

Against war it may be said that it makes the victor stupid and the vanquished revengeful.

[Heraclitus had] pride not in logical knowledge but rather in intuitive grasping of the truth.

At every step one has to wrestle for truth; one has to surrender for it almost everything to which the heart, to which our love, our trust in life, cling otherwise. That requires greatness of soul: the service of truth is the hardest service. What does it mean, after all, to have integrity in matters of the spirit? That one is severe against one's heart...that one makes of every Yes and No a matter of conscience.