Solomon says in the Proverbs, "There are many ways
which appear good unto men: but the end thereof leads to the pit of hell" (Proverbs 14:12). He says this of those who do not understand the will of God, but follow their own will. For such people, not knowing the will of God, at first receive from Satan a fervor which is like joy, but is not joy; and afterwards it turns to gloom and lays them open. But he who follows the will of God endures great labor in the beginning, but afterwards finds rest and gladness.
The Letters of Ammonas, successor of Saint Antony