7 Let us not then despair of our safety, but let us pray; let us make invocation; let us supplicate; let us go on embassy to the King that is above with many tears! We have this fast too as an ally, and as an assistant in this good intercession. Therefore, as when the winter is over and the summer is appearing, the sailor draws his vessel to the deep; and the soldier burnishes his arms, and makes ready his steed for the battle; and the husbandman sharpens his sickle; and the traveller boldly undertakes a long journey, and the wrestler strips and bares himself for the contest.
So too, when the fast makes its appearance, like a kind of spiritual summer, let us as soldiers burnish our weapons; and as husbandmen let us sharpen our sickle; and as sailors let us order our thoughts against the waves of extravagant desires; and as travellers let us set out on the journey towards heaven; and as wrestlers let us strip for the contest. For the believer is at once a husbandman, and a sailor, and a soldier, a wrestler, and a traveller. Hence St. Paul says, “We wrestle not against flesh and blood, but against principalities, against powers.
Put on therefore the whole armour of God.” Have you observed the wrestler? Have you observed the soldier? If you are a wrestler, it is necessary for you to engage in the conflict naked. If a soldier, it behooves you to stand in the battle line armed at all points. How then are both these things possible, to be naked, and yet not naked; to be clothed, and yet not clothed! How? I will tell you. Divest yourself of worldly business, and you have become a wrestler. Put on the spiritual armour, and you have become a soldier.
Strip yourself of worldly cares, for the season is one of wrestling. Clothe yourself with the spiritual armour, for we have a heavy warfare to wage with demons. Therefore also it is needful we should be naked, so as to offer nothing that the devil may take hold of, while he is wrestling with us; and to be fully armed at all points, so as on no side to receive a deadly blow. Cultivate your soul. Cut away the thorns. Sow the word of godliness. Propagate and nurse with much care the fair plants of divine wisdom, and you have become a husbandman.
And Paul will say to you, “The husbandman that labours must be first partaker of the fruits.” He too himself practised this art. Therefore writing to the Corinthians, he said, “I have planted, Apollos watered, but God gave the increase.” Sharpen your sickle, which you have blunted through gluttony— sharpen it by fasting. Lay hold of the pathway which leads towards heaven; rugged and narrow as it is, lay hold of it, and journey on. And how may thou be able to do these things?
By subduing your body, and bringing it into subjection. For when the way grows narrow, the corpulence that comes of gluttony is a great hindrance. Keep down the waves of inordinate desires. Repel the tempest of evil thoughts. Preserve the bark; display much skill, and you have become a pilot. But we shall have the fast for a groundwork and instructor in all these things.
Source: Homilies on the Statues (New Advent)