This style of meditation practice is designed to support both the strengthening of mettā (loving kindness) and samādhi (concentration). The kind and benevolent tone of the brahmavihārās (sacred dwellings) carries a deep beckoning of our hearts to be whole and steady, so these are wonderful and meaningful qualities to use for samādhi/concentration. After many days of practicing we can taste our hearts becoming whole and can better see the possibility of letting go of old habits based in greed, insecurity and hatred.