Mens ideas are the most direct emanations of their material state. – Karl Marx
The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force. – Karl Marx
The first requisite for the happiness of the people is the abolition of religion. – Karl Marx
The development of civilization and industry in general has always shown itself so active in the destruction of forests that everything that has been done for their conservation and production is completely insignificant in comparison. – Karl Marx