In order to have real transformation, we have to deal with the roots of our anger—looking deeply into its cause. If we don’t, the seeds of anger will grow again. If we practice mindful living, planting new, healthy, wholesome seeds, they will take care of our anger, and they may transform it without our asking them to do so. Our mindfulness will take care of everything, as the sunshine takes care of the vegetation. The sunshine does not seem to do much, it just shines on the vegetation, but it transforms everything. Poppies close up every time it gets dark, but when the sun shines on them for one or two hours, they open. The sun penetrates into the flowers, and at some point, the flowers cannot resist, they just have to open up. In the same way, mindfulness, if practiced continuously, will provide a kind of transformation within the flower of our anger, and it will open and show us its own nature. When we understand the nature, the roots, of our anger, we will be freed from it.
– From Peace Is Every Step: The Path of Mindfulness in Everyday Life