NONSENSE...
Mat 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
Mat 11:29 Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
Mat 11:30 For my yoke is easy, and my burden is light.
Heb 4:16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
Sometimes it's clinical...Sometimes it's spiritual...
Be that as it may, people should NOT be made to feel bad, or less of a Christian, if they seek medical attention for their depression. It is NOT a failing of faith or any other such nonsense. If they want to continue to pray, it may bring them some measure of comfort, but for out of whack brain chemicals, pharmacology should be considered and tried.