The Guru Granth Sahib, a Sikh religious text, promotes a moral teaching that Guru Sahib explains is about living a life of Truth, believe in one God (creator of universe), respect for others, and high moral standards.
In this article below Guru Granth Sahib is used to describe depression and it’s causes and cures.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705682/As per the text, remembering Lord (Prabh simar) and meditation (dhyan) can free both the body and mind of any illness (611-11). Those who meditate on the Lord's name, with focused consciousness, remain stable forever (87-5). Raja Yoga, the Yoga of meditation, is said to give the perfect peace (sukh) and contentment (santokh) to an individual (p. 188). Samaadhi has been described as the final and ultimate end of a happy life, a sweet pleasure (106-15), wherein one merges imperceptibly into the Lord (90-18). However, an assertion is made that meditation should be done with the name of the Lord if it is to have any power. For example, meditation without the Lord's name was compared to an imaginary rider on a horse, or a eunuch caressing a woman, someone trying to milk an ox, someone riding a cow to chase a tiger, or someone going shopping without money (p. 198).
Studies of prayer as treatment or preventive interventions for health problems are rare and often not published in scientific journals. For example, a study done in Amritsar on the regular recitors of Sukhmani Sahib