I’m greatly delighted to inform from your letter that you’ve been promoted as Officer (Present position name) from the (Institute name). This had been dream the past few years. God have been bountiful in fulfilling your current long cherished desire.
Unquestionably, the volume of work and responsibilities in your case will increase in another office. I hope your habits towards your subordinates will still be characterized by the same warmth of feeling and humanity because it was when you had been officer (past job position).
Please accept my Cordial love, Best wishes and Heartiest congratulations.