My theory, which is worth exactly nothing, is that “mental illness” is an absence of God, a disease of the soul. As differs from low IQ, brain injury etc.
OK. I hope you never have cause to rethink that position (by having a loved one descend into real mental illness - bipolar disorder, schizophrenia, or the like). Frankly, I wish I’d had the luxury of never experiencing it up close, so I could remain where I was before having to involuntarily commit a family member, thinking that shrinks are useless, and all you needed to do was to pull yourself self up by the bootstraps, dust yourself off, and get back in the game. It’s just not that easy.