St. Leo the Great on Lent

Use Lent to vanquish the enemy, and be thus preparing for Eastertide. Accordingly, dearly-beloved, that we may be able to overcome all our enemies, let us seek Divine aid by the observance of the heavenly bidding, knowing that we cannot otherwise prevail against our adversaries, unless we prevail against our own selves. For we have many encounters with our own selves: the flesh desires one thing against the spirit, and the spirit another thing against the flesh. And in this disagreement, if the desires of the body be stronger, the mind will disgracefully lose its proper dignity, and it will be most disastrous for that to serve which ought to have ruled. But if the mind, being subject to its Ruler, and delighting in gifts from above, shall have trampled under foot the allurements of earthly pleasure, and shall not have allowed sin to reign in its mortal body, reason will maintain a well-ordered supremacy, and its strongholds no strategy of spiritual wickednesses will cast down: because man has then only true peace and true freedom when the flesh is ruled by the judgment of the mind, and the mind is directed by the will of God. And although this state of preparedness, dearly-beloved, should always be maintained that our ever-watchful foes may be overcome by unceasing diligence, yet now it must be the more anxiously sought for and the more zealously cultivated when the designs of our subtle foes themselves are conducted with keener craft than ever. For knowing that the most hollowed days of Lent are now at hand, in the keeping of which all past slothfulnesses are chastised, all negligences alerted for, they direct all the force of their spite on this one thing, that they who intend to celebrate the Lord's holy Passover may be found unclean in some matter, and that cause of offence may arise where propitiation ought to have been obtained.

Fights are necessary to prove our faith. As we approach then, dearly-beloved, the beginning of Lent, which is a time for the more careful serving of the Lord, because we are, as it were, entering on a kind of contest in good works, let us prepare our souls for fighting with temptations, and understand that the more zealous we are for our salvation, the more determined must be the assaults of our opponents. But "stronger is He that is in us than He that is against us," and through Him are we powerful in whose strength we rely: because it was for this that the LORD allowed Himself to be tempted by the tempter, that we might be taught by His example as well as fortified by His aid. For He conquered the adversary, as ye have heard, by quotations from the law, not by actual strength, that by this very thing He might do greater honour to man, and inflict a greater punishment on the adversary by conquering the enemy of the human race not now as God but as Man. He fought then, therefore, that we too might fight thereafter: He conquered that we too might likewise conquer. For there are no works of power, dearly-beloved, without the trials of temptations, there is no faith without proof, no contest without a foe, no victory without conflict. This life of ours is in the midst of snares, in the midst of battles; if we do not wish to be deceived, we must watch: if we want to overcome, we must fight. And therefore the most wise Solomon says, "My son in approaching the service of God prepare thy soul for temptation." For He being a man full of the wisdom of God, and knowing that the pursuit of religion involves laborious struggles, foreseeing too the danger of the fight, forewarned the intending combatant; lest haply, if the tempter came upon him in his ignorance, he might find him unready and wound him unawares.

- Excerpted from Sermon 39, St. Leo the Great