Sceptics are yet the most credulous.

What is important in life is life, and not the result of life.

The greatest joy of a thinking man is to have searched the explored and to quietly revere the unexplored.

The solution of every problem is another problem

When intelligent and sensible people despise knowledge in their old age, it is only because they have asked too much of it and of themselves.

Let us not dream that reason can ever be popular. Passions, emotions, may be made popular; but reason remains ever the property of an elect few.

Writing history is a method of getting rid of the past.