Replying to Fucking Cancer

Just got the news that one of my favorite teachers at my highschool was diagnosed with kidney cancer, and apparently has a pretty big tumor as well. This teacher was one of the chillest teachers I've ever met, and he never sugar-coated an answer, just gave it to you straight up. As far as I know, he plans on being able to teach again next semester, but at this point I don't know how likely that'll be. At this point I'm pretty upset about the whole thing, because he taught me so many life lessons that other teachers overlooked.