Why should my heart be full of love vs. not having love in it? For one thing – love just feels good. A heart full of love and gratitude is a happy heart. A heart devoid of those things can never be happy. The more we let love control our hearts, our souls, our lives and our actions – the happier we will be. The happier the people around us will be. The happier the people who love us will be. The more love we share the more we affect the universe toward happiness.