In order to remain true to oneself one ought to renounce one's party three times a day.
It takes a very deep-rooted opinion to survive unexpressed.
Take heed of critics even when they are not fair; resist them even when they are.
The biologist passes. The frog stays the same.
Nothing leads the scientist so astray as a premature truth.
We give others praise which we ourselves don't believe, as long as they respond with praise we can believe.