(Pro 18:14 KJV) The spirit of a man will sustain his infirmity; but a wounded spirit who can bear?
What is an unbroken spirit like? Sometimes you can define things by saying what it is not. An unbroken spirit is not a Pollyanna foolishness that sees everything as wonder and ignores evil. An unbroken spirit does not radiate strength and confidence. It has tremendous strength but it is not the strength that is recognized by the pagan world around it. It is an endurance runner or a construction worker carrying heavy loads all day, not a bulky weightlifter that can put massive amounts of iron over his head a few times. And there is a quiet confidence that does not go running to the basement to hide in a corner every time a car backfires on the street.
I think one of the requirements of an unbroken spirit is a constant flow of maintenance from the Holy Spirit. A bit of lubrication can keep a lock from getting sticky. A change of oil keeps an engine running in an old clunker.
So? Left to itself, you spirit will break. Kept in constant contact with the living God it will “endure” (3557). Your choice. Your spirit.