When in battle and a front of soldiers appears to attack you, one does not stay in place to imagine in his soul striking the enemy, but fights valiantly onward or flees to his fortress to find refuge. So in prayer, we must find a suitable place, even a castle as St. Anthony did, to pray within in peace. He did not fight inwardly seated in the city, market, or even in his own abode, persistently praying in an unsuitable place, but flew and hid castled by walls.