The only source of knowledge is experience. - Albert Einstein

Most people say that is it is the intellect which makes a great scientist. They are wrong: it is character. - Albert Einstein

We cannot solve our problems with the same thinking we used when we created them. - Albert Einstein

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

Make everything as simple as possible, but not simpler. - Albert Einstein

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning. - Albert Einstein

It's not that I'm so smart, it's just that I stay with problems longer. - Albert Einstein