There is another Gemara which highlights this point (בבא בתרא ע"ד.). רבה בר בר חנה was walking in the midbar when he met a shepherd who told him that he will reveal to him the place where the earth swallowed Korach. Surely, he showed him a fault in the earth from which smoke was rising. Standing there, רבה heard a voice being emitted from the cracks which said משה אמת ותורתו אמת Moshe Rabbeinu and his Torah are all emess, true, whereas they are falsifiers. The shepherd then told him that he observes this phenomenon every thirty days. Some meforshim say this was every Rosh Chodesh. (עי' דברי יואל הנ"ל)
Hence, this Gemara can be explained with the earlier Gemara: every beginning of the month, when the moon is renewed the lesson of the moon is again conceptualized. The idea that a person must be a makabel, ready to accept and absorb from those greater or bigger than him is again demonstrated.
Essentially, it is Korach who teaches us this lesson for he proved the severity of the results of not being able to accept from those greater than himself.
Seforim tell us that the fact that Yidden count the months through the levanah, the moon, rather than the sun, is symbolic to this middah of Klal Yisrael. The בת עין explains a Gemara with this idea. He says that at the time of creation, after the moon was punished, he complained that it isn't just that because he pointed out a true concept he must now be diminished. To this, Hashem comforted him that Klal Yisrael will keep a lunar year; they will count their times according to the moon. The Bas Eyin says that the fact that the other nations count a solar year, according to the sun, whereas the yidden count according to the moon, reflects the fact that yidden are mekablim, they are constantly accepting from Hashem.
On this note, the possuk says כי אתם המעט מכל העמים which in the literal sense means we are the minority. However, Chazal say that it also means that Yidden make themselves small, they have הכנעה, and are ready to accept from others, which is the foundation of all middos, for having this trait allows for one to grow in all other areas. Whereas, otherwise it hinders progression. (בת עין פ' פנחס)
By the mitzvah of Rosh Chodesh the possuk says: החודש הזה לכם ראש חדשים (שמות יב ב) This month is for you the head of the months. The Shem MiShmuel says that this possuk also eludes to this idea; החודש הזה -- this concept that the Jewish month is marked by the renewal of the moon is לכם, for you, it signifies you, Klal Yisroel. The virtue of Am Yisroel is essentially its הכנעה, its readiness to comply and accept from the greater authority and teachers, and ultimately from Hashem Yisborach Himself. (שם משמואל ויקרא - החודש)
May we all merit to live with the correct mindset and clear Emunah that Hashem runs the world down to the smallest detail. And with that we will eradicate all feelings of קנאה. Thus, we will live a life of tranquillity, and will be able to serve Hashem and fulfil our mission without any ill feelings.