[Ditto]

True depression isn't about doubt. It's more to do with despair, combined with mental fatigue and more problems than a person can juggle at one time.

It's a medical condition caused by chemical imbalances more often than a psychological condition. If one has those imbalances, even life's minor aggravations can drive people into a very dark state. There are medications that help.

[Reddy]

"It's a medical condition caused by chemical imbalances more often than a psychological condition"

Yes, it's like having a cold. Most people don't advise those with colds to pray and automatically get well. (Although that CAN happen!) : )