"Simplicity is the ultimate sophistication." -- Leonardo da Vinci

"If you can't explain it simply, you don't understand it well enough." -- Albert Einstein

"Two things fill me with constantly increasing admiration and awe, the longer and more earnestly I reflect on them: the starry heavens without and the moral law within." -- Immanuel Kant

"Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are part of nature and therefore part of the mystery that we are trying to solve." -- Max Planck

"As soon as man does not take his existence for granted, but beholds it as something unfathomably mysterious, thought begins." -- Albert Schweitzer

"No problem can be solved from the same level of consciousness that created it" -- Albert Einstein

"Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it" -- Niels Bohr

"The only thing that interferes with my learning is my education" -- Albert Einstein

"The first principle is that you must not fool yourself and you are the easiest person to fool" -- Richard Feynman

"Philosophers say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong" -- Richard Feynman

"When things are going well, something will go wrong. When things just can't get any worse, they will. Anytime things appear to be going better, you have overlooked something." -- Richard Feynman