It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory, resulting in a very great theoretical development, are completely trivial from any point of view except their relevance to the structure of a theoretical system. – Talcott Parsons
My definition [of a philosopher] is of a man up in a balloon, with his family and friends holding the ropes which confine him to earth and trying to haul him down. – Louisa May Alcott, in Life, Letters, and Journals, ed. E.D. Cheney, 1889
When cowardice is made respectable, its followers are without number both from among the weak and the strong; it easily becomes a fashion. – Eric Hoffer