I am not yet young enough to know everything.
Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand
For my part I know nothing with any certainty, but the sight of the stars makes me dream.
A wise man speaks because he has something to say; a fool because he has to say something.
Supposing is good, but finding out is better.
I am against religion because it teaches us to be satisfied with not understanding the world.
There are never failures -- only gained experience, wisdom, knowledge and lessons in life
Understanding is much deeper than knowledge. There are many people who know us, but very few who understand us.
So little time, so much to know!
The past is a source of knowledge, and the future is a source of hope. Love of the past implies faith in the future.