While research supports the idea that altruistic acts bring about happiness, it has also been found to work in the opposite direction—that happier people are also kinder.
wˌaɪl ɹᵻsˈɜːtʃ səpˈoːɹts ðɪ aɪdˈiə ðæt ˌɔːltɹuːˈɪstɪk ˈækts bɹˈɪŋ ɐbˌaʊt hˈæpɪnəs, ɪt hɐz ˈɔːlsoʊ bˌɪn fˈaʊnd tə wˈɜːk ɪnðɪ ˈɑːpəzˌɪt dᵻɹˈɛkʃən—ðæt hˈæpɪɚ pˈiːpəl ɑːɹ ˈɔːlsoʊ kˈaɪndɚ.