In the right key one can say anything. In the wrong key, nothing: the only delicate part is the establishment of the key.

The British churchgoer prefers a severe preacher because he thinks a few home truths will do his neighbors no harm.

When the world goes mad, one must accept madness as sanity; since sanity is, in the last analysis, nothing but the madness on which the whole world happens to agree.

I am of the opinion that my life belongs to the whole community and as long as I live, it is my privilege to do for it whatever I can.

No doubt it is easy to demostrate that property will destroy society unless society destroys it.

Science can never solve one problem without raising ten more problems.

Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.