数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
The political liberty of the subject is a tranquility of mind arising from the opinion each person has of his safety.
The mind is not a machine to be understood, but a living process to be experienced.
Will you play it safe, or will you be a little bit swashbuckling?
The only thing I can rely on is my own perception, and that is always changing.