Albert Einstein has some pretty amazing quotes (taken from this site):

The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift.

People like you and I, though mortal of course like everyone else, do not grow old no matter how long we live...[We] never cease to stand like curious children before the great mystery into which we were born. (in a letter to Otto Juliusburger)

We have to do the best we can. This is our sacred human responsibility.

The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.

The search for truth is more precious than its possession

Common sense is the collection of prejudices acquired by age eighteen.

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.

I have no special talents. I am only passionately curious.

With fame I become more and more stupid, which of course is a very common phenomenon.

Wisdom is not a product of schooling but of the life-long attempt to acquire it.

Few are those who see with their own eyes and feel with their own hearts.

He who joyfully marches in rank and file has already earned my contempt. He has been given a large brain by mistake, since for him the spinal cord would suffice. (this one is really harsh.. but makes sense..)

Intellectuals solve problems; geniuses prevent them.

Setting an example is not the main means of influencing others; it is the only means (i love this one :))