The field of battle between God and Satan is the human soul. It is in the soul that the battle rages every moment of life. The soul must give free access to the Lord so that it may be fortified by Him in every repect and with all kinds of weapons; that His light may enlighten it to combat the darkness of error; that it may be clothed with Jesus Christ. To be clothed with Jesus Christ it is necessary to die to oneself. That which comes from Satan begins with calmness and ends in storm, indifference, and apathy. In the spiritual life he who does not advance goes backward. It happens as with a boat which always must go ahead. If it stands still the wind blows it back. Fix the time, the length of your meditation, and do not rise from your place until you have finished even at the cost of being crucified.
-- Saint Pio of Pietrelcina