What does ripples in my heart describe?

This sentence means to describe a feeling caused by being touched by some kind of stimulation or emotion.

Ripples in the heart are like ripples in a calm lake when stones are thrown into it. The mind will also ripple due to external things or inner thoughts. This feeling is caused by positive emotions such as joy, excitement, and surprise. It is also caused by negative emotions such as sadness, worry, and fear. No matter what kind of emotion it is, it will set off layers of ripples in the heart, making it difficult to calm down.