Avoda Zara 6

Rava said that the reason our Mishna prohibits one from doing business with an idolater there days prior to his festival is because the idolater will be euphoric with his gain and he will praise his deity. We know that the measure of good is exponentially greater than the measure of evil. We can suggest that if an idolater is so enthusiastic that any gain that he achieves will prompt him to praise his deity, then certainly any gain that Jew attains will be cause to thank HaShem. We find this idea expressed regarding Shabbos, where when one finds a delicacy and designates it for Shabbos (Beitzah 16a). Ideally, one should be preoccupied the entire week with Shabbos. We can learn from the pagans how much we need to focus on the gifts that HaShem proffers to His Chosen Nation.