The Rebbe expresses joy at the recent gatherings and encourages continued spiritual growth, especially during the uplifting days from Pesach to Shavuos. He emphasizes the importance of proper tefillin, the impact of translating and distributing his letters in the local language, and suggests compiling a booklet of general letters to inspire others.
https://www.torahrecordings.com/rebbe/igroskodesh/015/008/5403