About "good heart" different people have different understanding.It is I to its point of view.
First,the "good heart" can be understood as a kind heart.A person but kind-hearted,and inside of yourself to revenue,modest,not in a reproachful way to chide others,don't know to have mercy on others and forgive others.
Another understanding to "good heart" is for a love of things.Like love life,love the natural,love life,love the motherland,used to describe the extent of the love is deep.
In a word,"good heart" is a very positive words,express the heart long for a beautiful,the desire for better a state of mind.Personally,I hope I have a good heart,also hope I can love so lovely things and people.