I don't believe this to be true in this day and age. Doing everything with a kind heart just gets taken as weakness. I'll stay true to my heart but forget about being nice to those people that don't deserve it anymore.
Lately, this seems to be incredibly true. I pour the good within myself into others and for a short time, my soul is sour and my heart is bitter. Then I remember that if I love with all I have, that person could potentially be a better person because of me.