When you have fixed beliefs your vision of the world around you is skewed.

Fixed beliefs by their very nature are rigid unwavering forms of influence
that have an almost gravitational effect on your decisions as they pull
your thoughts and reasoning toward the fixed point of view of that belief.

Your husband accepts these limiting fixed beliefs as true actual fact.

However, as his beliefs are revised his thoughts and decisions
are also changed as are the results he will get from those decisions.

Position him so that the world provides true answers to his eyes and ears.
Allow the world of reality in actuality to disprove or cause him to alter
his own fixed beliefs.