That which can be asserted without evidence, can be dismissed without evidence.
Anything that gives us new knowledge gives us an opportunity to be more rational.
Natural science does not simply describe and explain nature: it is part of the interplay between us and nature.
Study without desire spoils the memory, and it retains nothing that it takes in.
The smallest minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities.
Go to Heaven for the climate. Hell for the company.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
Freedom is the right to tell people what they do not want to hear.
Every cause produces more than one effect.
Time and space are modes by which we think and not conditions in which we live.