There is a story in the Mahābhārata illustrating how by Kṛṣṇa’s eating, the sixty thousands disciples of Durvāsā Muni were all satisfied. Therefore it is a fact that if by our life (prāṇaiḥ), by our wealth (arthaiḥ), by our intelligence (dhiyā) or by our words (vācā) we can satisfy the Supreme Personality of Godhead, naturally the entire world will become happy. Therefore our main duty is to satisfy the Supreme Godhead by our actions, our money and our words. This is very simple. Even if one does not have money, he can preach the Hare Kṛṣṇa mantra to everyone. One can go everywhere, to every home, and request everyone to chant the Hare Kṛṣṇa mantra. Thus the entire world situation will become very happy and peaceful.
Ref >> Srila Prabhupada Vani.