Hearts without holes can't be filled.
"The whole need not a physician, but the sick."
I thank God regularly that I have not had many trials that I know others have had, but I am grateful that my heart has had holes that needed to be filled and that God (and others, as His hands) has tended to those holes, in various ways.
My primary purpose in much of my interaction with others is an attempt simply to help fill holes in other hearts. I might not be able to be a curer in most cases, but I can try to be a healer.