Experience shows that what happens is always the thing against which one has not made provision in advance.

It is better to be roughly right than precisely wrong.

The considerations upon which expectations of prospective yields are based are partly existing facts which we can assume to be known more or less for certain, and partly future events which can only be forecasted with more or less confidence.

He had one illusion - France; and one disillusion - mankind, including Frenchmen.

There is no harm in being sometimes wrong - especially if one is promptly found out.

When somebody persuades me I am wrong, I change my mind.

Newton was not the first of the age of reason, he was the last of the magicians.