João Pedro Lopes

“One reason that he was reluctant to relinquish some of his works and declare them completed was that he relished a world in flux. He had an uncanny ability to convey movements—of the body and the mind, of machines and horses, and of rivers and everything else that flows. No instant, he wrote, is self-contained, just as no action in a theatrical pageant nor any drop in a flowing river is self-contained. Each moment incorporates what came right before and what is coming right after. Similarly, he looked upon his art and engineering and his treatises as a part of a dynamic process, always receptive to a refinement by the application of a new insight.”
― Walter Isaacson, Leonardo da Vinci

“The question whether objective truth can be attributed to human thinking is not a question of theory but is a practical question. Man must prove the truth — i.e. the reality and power, the this-sidedness of his thinking in practice. The dispute over the reality or non-reality of thinking that is isolated from practice is a purely scholastic question.”
― Karl Marx, Selected Works, Vol 1

“He that loves reading has everything within his reach.”
― William Godwin

“In my whole life, I have known no wise people (over a broad subject matter area) who didn't read all the time -- none, zero. You'd be amazed at how much Warren reads--and at how much I read. My children laugh at me. They think I'm a book with a couple of legs sticking out.”
― Charles T. Munger, Poor Charlie's Almanack: The Wit and Wisdom of Charles T. Munger