St. Anthony the Great:

"The more moderate life a person leads, the calmer he becomes, because he does not fret about many things — about servants and accumulation of material things. If we do get attached to these (earthly things), as a consequence, we expose ourselves to tribulations that lead us to grumbling against God. In this way, the desire for these many things fills us with confusion and we wander in the darkness of a sinful life, not even knowing ourselves."