I have taught crochet classes in our school districts evening education classes for over 30 years and boy, you can bet it is true that it heals the heart. I had more than one student who was in great depression sent to me by a doctor just because it is so healing. I had one who was suicidal and after 8 weeks, she told me, "This has SAVED my life!!" What more in life could I ask for??
P.S. I have only had two students who never came back.