Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.
数学家的工作是在别人看到混乱的地方发现模式。
When you forgive others, they may not notice, but you will heal. Forgiveness is not something we do for others; it is a gift to ourselves.
No one will protect what they don't care about, and no one will care about what they have never experienced.