It should live in the heart (Saint Tikhon of Zadonsk)

Like every virtue, love must live in the heart. Unless it does so, it doesn’t exist, in practice. Because God didn’t say ‘Love’, ‘Be humble’, ‘Be merciful’ , ‘Pray’ and so on for our ears but for our heart. So we have to have love, humility, kindness, prayer and all the other virtues. And when they’re in our heart, they’ll certainly find external expression, just as a fire gives off heat and myrrh exudes fragrance.