Adventure is an event out of the ordinary without being necessarily extraordinary.

Adventure is not to say "always" but to say "immediately".

Adventure is just a romantic name for trouble.

Adventure is stepping through brand-new doors with your mouth shut and your eyes wide open.

Ambition is the golden mean between sloth and greed.

Ambition is overrated — Climbing is performed in the same posture as creeping.

Ambition is like hunger : it obeys no law but its appetite.

Ambition is most aroused by the trumpet-clang of another's fame.

Change is impossible — The tail of the greyhound will not be made straight even though it remains seven years in the melting-pot.

Change is always possible — Whatever your past has been, you have a spotless future.

Change is unlikely in a great man — A god does not change his ways.

Change is all about timing — It is not best to swap horses while crossing the river.

A Discovery is great, if it is a fact whose appearance in science gives rise to shining ideas, whose light dispels many obscurities and shows us new paths.

Discovery is secondary to persuasion — In science the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.

Discovery is seeing what everybody has seen and thinking what nobody has thought.

Discovery is the ability to be puzzled by simple things.