隐心而后动 这是我上司的一句签名不知是什么意思?

To Whom It May Concern：
It is my great pleasure to recommend Miss Lili Zhang to you,as she was one of my finest students in our department.
Miss Zhang began attending my English classes in the Department of International Trade University in 1992 and graduated in spring of 1996.Though it has been over eight years since I last saw her,the deep impression she made on me has not faded in the least.She is very intelligent,honest,creative,articulate,adaptive person.Her high academic achievement speaks for itself:she consistently scored in the top 5 in class.
I am certain that Miss Zhang would make great contributions to your company,and I strongly recommend her for the position.Please do not hesitate to inquire further if I can be of help to you.
Sincerely,
Dr.Tim Wu