In every trial and in all (spiritual) warfare use prayer as your invincible weapon, and by the grace of Christ you will be victorious. Let your prayer be pure, as our wise teacher counsels. For he says: “I would have men pray everywhere, lifting up holy hands, without anger and without quarreling” (1 Timothy 2:8). But the person who neglects such prayer will be delivered over to trials and passions.
-St Theodoros the Great Ascetic
Prayerful Life 