Poor health will both reduce the time you have in this world and your capability to live the life you want to live. Therefore, if we want to live for a long time with a mind and body that can take us where we want, we must take care of our health.
I’m not saying life can’t be good if we’re sick, I’m saying that people would like to feel capable of living the way they value and to live for a long time. Health, consequently, is absolutely fundamental.