Amma Theodora said that neither asceticism, nor vigils nor any kind of suffering are able to save, only true humility can do that.

 There was an anchorite who was able to banish the demons; and he asked them, "What makes you go away?  Is it fasting?"  They replied, "We do not eat or drink."  "Is it vigils?"  They replied, "We do not sleep."  "Is it separation from the world?"  "We live in the deserts."  "Then what power sends you away?"  They said, "Nothing can overcome us, but only humility."  Amma Theodora concluded by saying, "Do you see how humility is victorious over the demons?"