Having proper mental health is essential because stress and depression bleat your body's defenses and any illness is capable, at that time, of having the greatest possible negative effect on you and there is no defense against it.
That is the essential reason or one of them why fighting stress is so essential.

One book that changed my life is A Real Man. It is real and chronicles the exploits of a pilot during World War II. But, the really great thing is that he lost both his legs in combat, got prosthetics and went back into combat.
From that point on, I have run out of excuses for doing difficult or seemingly impossible things.
It was the first book my father suggested to me. Thanks for sharing. Happy journey. Cheers and best regards.