patraṁ puṣpaṁ phalaṁ toyaṁ yo me bhaktyā prayacchati tad ahaṁ bhakty-upahṛtam aśnāmi prayatātmanaḥ (Bg. 9.26)

One cannot satisfy the Supreme Lord by his riches, wealth or opulent position, but anyone can collect a little fruit or flower and offer it to the Lord. The Lord says that if one brings such an offering in devotion, He will accept it and eat it. When Krsna eats, the entire world becomes satisfied. There is the story in the Mahabharata illustrating how by Krsna's eating, the 60,000 disciples of Durvasa Muni were all satisfied. Therefore it is a fact that if by our life (pranaih), by our wealth (arthaih), by our intelligence (dhiya) or by our words (vaca) 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 Krsna mantra to everyone. One can go everywhere, to every home, and request everyone to chant the Hare Krsna mantra. Thus the entire world situation will become very happy and peaceful.