There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

Ideas too are a life and a world.

One's first step in wisdom is to question everything - and one's last is to come to terms with everything.

There is no more important rule of conduct in the world than this: attach yourself as much as you can to people who are abler than you and yet not so very different that you cannot understand them.

Everyone is perfectly willing to learn from unpleasant experience - if only the damage of the first lesson could be repaired.

A man has virtues enough if he deserves pardon for his faults on account of them.

The most dangerous untruths are truths slightly distorted.