In our complex world, there cannot be fruitful initiative without government, but unfortunately there can be government without initiative.

Brief and powerless is man's life; on him and all his race the slow, sure doom falls pitiless and dark.

Arithmetic must be discovered in just the same sense in which Columbus discovered the West Indies, and we no more create numbers than he created the Indians.

It is clear that thought is not free if the profession of certain opinions makes it impossible to earn a living.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

There are certain things that our age needs. It needs, above all, courageous hope and the impulse to creativeness.

Freedom in education has many aspects. There is first of all freedom to learn or not to learn. Then there is freedom as to what to learn. And in later education there is freedom of opinion.