Physical and spiritual health are interlinked.
Not inextricably, because I have known utterly selfish, greedy and stingy people with radiant good health, and living to a ripe old age.
I have also known and known of saintly people who are sick.
So, it’s not a infallible rule.
It’s just something I have observed in my own experience and that of others. When all is well with my soul, I rarely have colds, coughs, or other illnesses.
When I am under stress, I get a cold relatively easily. Get allergies. Acid reflux!
My spiritual health and my happiness spill over onto physical health.
Jesus makes the connection between sin and sickness. He tells the paralytic, “Go and sin no more, lest something worse befall you.” John 5. In Luke 7, he tells the paralytic, “Your sins are forgiven.”
So when one is sick, it is worth repenting, and surrendering one’s life to God again.
As has often been observed, sin (hatred, envy, unforgiveness) has physical consequences, will spill over into physical or mental illness. And radiant spiritual health is often mirrored in radiant physical health. If one continues exercising.
Though this rule, as I noted before, has exceptions.