Second-Guessing The Doctor

There are times when a doctor prescribes medicine to a patient and the health insurance company refuses to authorize payment for the high-priced medication.

Similarly, Hashem, the Doctor of Doctors, prescribes us the Torah and there are times when our yetzer hara refuses to accept it even though it benefits our neshomas.

How can a health insurance company say that the medicine costs too much and question the Doctor's expertise when prescribing a treatment that He knows will help a patient?