Man must rise above the Earth - to the top of the atmosphere and beyond - for only thus will he fully understand the world in which he lives.

I know what I do not know.

I know you won't believe me, but the highest form of Human Excellence is to question oneself and others.

By far the greatest and most admirable form of wisdom is that needed to plan and beautify cities and human communities.

It is better to make a mistake with full force of your being than to carefully avoid mistakes with a trembling spirit.

It has been shown that to injure anyone is never just anywhere.

If I can assign names as well as pictures to objects, the right assignment of them we may call truth, and the wrong assignment of them falsehood.