The Rebbe congratulates the recipient on being chosen as Rosh Av Beit Din, expressing wishes for success in merging justice with compassion. He notes the deeper meanings in the title and prays the role brings joy. Due to Purim preparations, he encloses a kuntres and letter in place of a full response
https://www.torahrecordings.com/rebbe/004_igros_kodesh/adar_beis/951