老脑筋就像老马；如果你想保持它们的工作状态，就必须锻炼它们。

The historian’s task is to understand the past, the novelist’s to make it live.

Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.