Many people live out a full life with MS but please don't think that will to live and positive attitude can beat a disease if the disease wants to take you badly enough. I and many others have proof of that and it's a disservice to those who have fought valiantly and yet succumbed.
I never said a positive attitude cures a disease.
His attitude towards the disease is that
he isn't going to let it best him. I'm relaying my
uncle's attitude to the OP. He has had severe MS for nearly a lifetime - 53 years.
He believes how he handles what life has dealt him will determine the quality of life he has. It would have been a disservice to his family, in his opinion, to live in a perpetual pity party. He has episodes of despair and depression, times when he sends my aunt away in tears because the MS is talking, but he doesn't let that dictate how he will spend his time left on this earth. Life is too short for all of us.
I could list individually how often he was in the hospital last year, the cath issues, the yearly pneumonia, the times he's recently nearly choked to death, the falls, and the falls, and more falls, the confusion, at times the inability to talk, and countless other issues, but to what purpose? That doesn't help the OP. He doesn't focus on that, and he doesn't want his family to, either. He suffers, but he is a proud man, and a stoic one. He despises a martyr.
He's lucky to have my aunt, who takes care of him, and four grown sons who will drop everything in a heartbeat to be there for him. A sister (my mother) who adores him, and grown, successful grandchildren. In the end, he won't be remembered for having a disease, but rather for being a positive force that has shaped generations of our family. In that sense, he wins.