It seems to me that, in every culture, I come across a chapter headed 'Wisdom.' And then I know exactly what is going to follow: 'Vanity of vanities, all is vanity.'

Words are probes. Some reach very deep, some only to a little depth.

An inner process stands in need of outward criteria.

To convince someone of the truth, it is not enough to state it, but rather one must find the path from error to truth.

I might say: if the place I want to get to could only be reached by way of a ladder, I would give up trying to get there. For the place I really have to get to is a place I must already be at now. Anything that I might reach by climbing a ladder does not interest me.

It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

One can mistrust one's own senses, but not one's own belief.