每当我们教孩子一些东西时，我们就阻止了他自己去发明它。
艺术不是奢侈品，而是必需品。
Everything can be taken from a man but one thing: the last of the human freedoms—to choose one's attitude in any given set of circumstances.
Mental processes exist because they serve a purpose.
"In mathematics, you don't understand things. You just get used to them."
Keep learning. It's the only way to stay relevant in a fast-changing world.