Better our hypotheses die for our errors than ourselves.
If we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them.
Every solution of a problem raises new unsolved problems.
It is wrong to ask who will rule. The ability to vote a bad government out of office is enough. That is democracy.
Science must begin with myths, and with the criticism of myths.
The scientific tradition is distinguished from the pre-scientific tradition by having two layers. Like the latter, it passes on its theories; but it also passes on a critical attitude towards them.