Kindness brings joy to the heart.

Meaning: When you are kind to others, you make them happy and you also make yourself happy.

Choice of Words: Kindness means being considerate and caring towards others. Brings means to carry or transport something from one place to another. Joy is a feeling of great happiness and pleasure. Heart is the organ that pumps blood through the body. When you put them together, the sentence means that being kind to others makes one feel happy and joyful.