Hi Princess, this interpretation is just excellent! You have nailed it! I am sure that God wanted to bring it to the attention of Chris that he, or someone in his life, was busy entertaining negative and soulish thoughts, which was or will not be good for his spiritual well-being and development.
A hat is supposed to be protection for the head (thoughts) but Chris or the relevant person was under the impression that his thoughts were or are protected and submitted to God’s will but clearly, it was not.
This does speak of a bit of deception in the sense that he or she thought he/she was only allowing God’s word in his thoughts while it was not the case. There must have been something, maybe just pertaining to a specific incident, that he or she thought is of God but it was exposed to be soulish thoughts.