Reason is like an open secret that can become known to anyone at any time; it is the quiet space into which everyone can enter through his own thought

When in our isolation we see our lives seeping away as a mere succession of moments, tossed meaninglessly about by accidents and overwhelming events; when we contemplate a history that seems to be at an end, leaving only chaos behind it, then we are impelled to raise ourselves above history.

I began the study of medicine, impelled by a desire for knowledge of facts and of man. The resolution to do disciplined work tied me to both laboratory and clinic for a long time to come.

Philosophy as practice does not mean its restriction to utility or applicability, that is, to what serves morality or produces serenity of soul.

The soul of a landscape, the spirits of the elements, the genius of every place will be revealed to a loving view of nature.

Philosophy is tested and characterised by the way in which it appropriates its history.

Philosophy can only be approached with the most concrete comprehension.