The dangers of not thinking clearly are much greater now than ever before. It's not that there's something new in our way of thinking - it's that credulous and confused thinking can be much more lethal in ways it was never before.Carl Sagan
We are faced with the paradoxical fact that education has become one of the chief obstacles to intelligence and freedom of thought.Bertrand Russell
Many a man will have the courage to die gallantly, but will not have the courage to say, or even to think, that the cause for which he is asked to die is an unworthy one.Bertrand Russell
I remain convinced that obstinate addiction to ordinary language in our private thoughts is one of the main obstacles to progress in philosophy.Bertrand Russell
Thought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.Bertrand Russell
It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist.Jean-Jacques Rousseau