Mental health is a fundamental part of christian spirituality, of being Christ-like - knowing who you are - I Am who I Am - being fair dinkum and down to earth about it (humble: from humous/earth)
Jws have fear upon fear, and concerns about demon possessed items, demons under the bed or jumping in their head, and 'postates, and the world ending (real soon anytime now), and not being worthy etc etc,
Aside from even all those bizarre distractions is the basic idea about not even being who you are, not thinking for yourself, denying what you believe and forcing a belief that doesn't gel while you simply deny the flaws in it. One becomes unwhole - not wholly
Good mental health is about being holy (whole) - saying and accepting what is true regardless of whether it seems to be disadvantageous.
In the story of the emporer's new clothes who was healthy mentally - I'd say the boy,