"A theory can be proved by experiment;..." - Quote by Albert Einstein

“If you do the same thing over and over again you cannot ever expect a different outcome.”

“The gravity is the first thing which you don't think”

“Each possession I own is but a stone around my neck.”

“Knowledge is a matter of science and no dishonesty or conceit whatsoever is permissible. What is required is definitely the reverse - honesty and modesty.”

“There are two kinds of solar-heat systems: passive systems collect the sunlight that hits your home, and active systems collect the sunlight that hits your neighbors' homes, too.”

“Discussion and argument are essential parts of science; the greatest talent is the ability to strip a theory until the simple basic idea emerges with clarity.”

“All social life is essentially practical. All mysterious which lead theory to mysticism find their rational solution in human practice and in the comprehension of the practice.”

“Practice should always be based upon a sound knowledge of theory.”

“Theory must mediate between all previous truths and certain new experiences”