4004 - Since all doctors agree that now is not the time for an operation, rejoice in this news.

What will happen down the road will be determined by Hashem. The fact that the students change every few months does not mean that what you have taught does not remain engraved in their minds. More importantly, look for ways to have them continue to stay connected. https://www.torahrecordings.com/rebbe/igroskodesh/012/004/4004