In religious life the benefit of Bitachon will be tranquility of the soul such as a servant would relies on his master. Rabbenu Bachya puts if very clearly, If a person in not putting his trust in H'sashem for example worrying, arranging, controlling, he is putting his trust in something other then. Such as his abilities, connection, resources. If he does this Rabbenu Bachya warns him, H'shem will take away his divine providence and leave him in the hands of what he trusts.
pg 349
pg 349
