Maybe one of these books could help him: https://www.amazon.com/Feeling-Good-New-Mood-Therapy/dp/0380810336 https://www.amazon.com/Feeling-Good-New-Mood-Therapy

Maybe one of these books could help him: https://www.amazon.com/Feeling-Good-New-Mood-Therapy/dp/0380810336 https://www.amazon.com/Feeling-Good-New-Mood-Therapy/dp/0380... https://www.amazon.com/Feeling-Great-Revolutionary-Treatment-Depression-ebook/dp/B08FRSQHFP https://www.amazon.com/Feeling-Great-Revolutionary-Treatment... The first one helped me understand how the mind influences the emotions, haven't read the second.