There is no reason to be jealous of others. As one tzaddik said, “If I don’t have something, that means I don’t need it. Because if I needed it, I would have it.”
In regards to spirituality too, remember that Hashem wants a different service from each person. Each individual creates a unique nachas ruach for Hashem. So why be jealous of others? They aren’t doing what you can do.
~ R’ Elimelech Biderman Shlita