Never underestimate your own ignorance.

Imagination without knowledge may create beautiful things, knowledge without imagination can create only perfect ones.

You cannot solve current problems with current thinking. Current problems are the result of current thinking.

A man has to work so hard so that something of his personality stays alive. A tomcat has it so easy, he has only to spray and his presence is there for years on rainy days.

The strength of the Constitution lies entirely in the determination of each citizen to defend it. Only if every single citizen feels duty bound to do his share in this defense are the constitutional rights secure.

Politics is for the present, but an equation is for eternity.

The beauty of it is that we have to content ourselves with the recognition of the miracle, beyond which there is no legitimate way out.