Dear XXX,
I write this letter to congratulate to your success.
I feel so happy for hearing the results for your work. I know it is your sweats that brought you that success. You changed my view of you by practical actions.
I heartfully congratulate to the great achievements that you deserved to get. In addition, I am so ashamed of my thoughts that you won't get any fruits and I apologize for that.
Yours,
Wang Lin