"In my free time I do differential..." - Quote by Karl Marx

“If I negate powdered wigs, I am still left with unpowdered wigs.”

“Under the ideal measure of values there lurks the hard cash.”

“Men's ideas are the most direct emanations of their material state.”

“If a person is constantly evolving, constantly reading new material and being exposed to new material and growing in life, then you're becoming, hopefully, a more intelligent and well-rounded individual. If you're not then something's wrong and you're sliding back in the other direction.”

“The last thing I'd learn, well into my career, was how to get on, how to say hello, how to get in with the audience.”

“Anyone who has never made a mistake has never tried anything new.”

“To be really happy and really safe, one ought to have at least two or three hobbies, and they must all be real.”

“Happy is the man who can make a living by his hobby”

“For a male person bric-a-brac hunting is about as robust a business as making doll-clothes.”