Musar for Shabbat 304:10

Therefore, it is good for a man not to wear conspicuous or expensive garments — neither he nor his wife nor his children, and so should it be with food and other matters so that others will not envy him. Let that man who has been blessed bountifully by the Creator see to it that others get some enjoyment from his possessions whether they be rich or whether they be poor. Let him conduct himself with his companions gently and deal kindly with them. We have already dwelt at length about this matter — the matter of a man being loved by his fellow creatures — if he is loved by everyone, then they will not envy him, and they will not covet anything that belongs to him. However, it is fitting for a man, that he should attempt to excel in good qualities, so that others may envy him and long to do as he does. And he who is careful not to envy others, — his body will not wither, and no worms will rule over him. As it is written : "But envy is the rottenness of the bones" (Prov. 14:30), "Any man who has envy in his heart, his bones rot; every man who has not envy in his heart, his bones do not rot" (Shabbath 152b).