We have just heard of the honors that your son has won. How proud you must be of him! We are both so glad for him and for you. Please congratulate him for us, and believe me,
Or:
Dear Mrs. Brown:
We are so glad to hear the good news of David's success; it was a very splendid accomplishment and we are all so proud of him and of you. Please give him our love and congratulations, and with full measure of both to you,
Congratulating A Friend Appointed To High Office
Dear John:
We are overjoyed at the good news! For once the reward has fallen where it is deserved. Certainly no one is better fitted than yourself for a diplomat's life, and we know you will fill the position to the honor of your country. Please give my love to Alice, and with renewed congratulations to you from us both.
Another example:
Dear Michael:
We all rejoice with you in the confirmation of your appointment. The State needs just such men as you—if we had more of your sort the ordinary citizen would have less to worry about. Our best congratulations!