For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.

优秀的数学家不是知道所有答案的人，而是能提出正确问题的人。

人们并不懒惰。他们只是有无力的目标——也就是说，那些不能激励他们的目标。

I pray Heaven to bestow the best of blessings on this house and all that shall hereafter inhabit it. May none but honest and wise men ever rule under this roof.

The more acute the experience, the less articulate its expression.

The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.

市场总是对的，而我总是错的。