Some minds are like concrete: thoroughly mixed up and permanently set.

You can call a jackass a thoroughbred but that doesn't make it so.

Do the best you can until you know better. Then when you know better, do better.

Great spirits have always encountered violent opposition from mediocre minds.

We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality.

Nothing is more difficult, and therefore more precious, than to be able to decide