Musar על יומא 76:1

But if they would know and understand that "no man can touch what is designated for his fellow even a hair's breadth" (Yoma 38b), and that everything is from G-d according to His wondrous judgment and unfathomable wisdom, they would have no reason whatsoever to feel pained by the good fortune of their neighbors.

However, that which can protect a person and save him from these detriments is trust in G-d. Namely, that a person casts his burden entirely upon G-d, knowing that it is certainly impossible for a man to lack what was designated for him, as our sages taught: "all of a person's sustenance [for the year] is fixed for him from Rosh Hashana [to Yom Kippur]" (Beitzah 16a). Likewise, they said: "no man can touch what was prepared for his fellow even to the extent of a hair's breadth" (Yomah 38b).