For what more fitly or more fully befits our care and solicitude than to prepare the people divinely committed to us and the army established in the heavenly camp with constant exhortations against the weapons and darts of the devil? For he cannot be a soldier fit for war who has not first been trained in the field, nor will he who seeks to obtain the contestant’s crown be crowned in the stadium, unless he first gives thought to the practice and skill of his powers. He is an old adversary