The tragedy is that we cannot believe the dogmas of religion and metaphysics if we have the strict methods of truth in heart and head, but on the other hand, we have become through the development of humanity so tenderly suffering that we need the highest kind of means of salvation and consolation: whence arises the danger that man may bleed to death through the truth that he realises.

Each word of Heraclitus expresses the pride and the majesty of truth, but of truth grasped in intuitions rather than attained by the rope ladder of logic.

I fear animals regard man as a creature of their own kind which has in a highly dangerous fashion lost its healthy animal reason - as the mad animal, as the laughing animal, as the weeping animal, as the unhappy animal.

God is Dead; but given the way of men, there may still be caves for thousands of years in which his shadow will be shown. And we - we still have to vanquish his shadow, too.

We are unknown to ourselves, we men of knowledge - and with good reason. We have never sought ourselves - how could it happen that we should ever find ourselves? It has rightly been said: "Where your treasure is, there will your heart be also"; our treasure is where the beehives of our knowledge are.

The greatest cure for love is still that time honoured medicine - love returned.

Love, too, has to be learned.