The Rebbe expresses hope for the recipient’s recovery and encourages them to strengthen their body, as physical health is essential for spiritual service. He highlights Kislev as a month of miracles and Chabad’s triumph, emphasizing the unity of body and soul in fulfilling Hashem’s will. He concludes with a blessing for visible and complete good.
https://www.torahrecordings.com/rebbe/igroskodesh/014/003/4903