The product of mental labor – science – always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production. – Karl Marx
Mens ideas are the most direct emanations of their material state. – Karl Marx
The ruling ideas of each age have ever been the ideas of its ruling class. – Karl Marx
Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science. – Karl Marx
What I like about sceptics is that in good science you need critics that make you think: Crumbs, have I made a mistake here? If you dont have that continuously, you really are up the creek. The good sceptics have done a good service, but some of the mad ones I think have not done anyone any favours. – James Lovelock