8 Well: these things alone might suffice to recommend our fleeing from this distemper. But there is no greater evil than inconsideration which causes men to be rivetted unto things that bring sorrow of heart and no advantage. Wherefore I exhort that you cut off the passion at its beginning: for just as a fever on its first attack, does not violently burn up the patients with thirst, but on its increase and the heightening of its fire causes from that time incurable thirst; and though one should let them fill themselves full of drink, it puts not out the furnace but makes it burn fiercer: so also it happens in regard to this passion; unless when it first invades our soul we stop it and shut the doors; having got in, from that time it makes the disease of those who have admitted it incurable. For so both good things and bad, the longer they abide in us, the more powerful they become.
And in all other things too, any one may see that this comes to pass. For so a plant but lately set in the ground is easily pulled up; but no more so when rooted for a long time; it then requires great strength in the lever. And a building newly put together is easily thrown down by those who push against it; but once well fixed, it gives great trouble to those who attempt to pull it down. And a wild beast that has made his accustomed haunt in certain places for a long time is with difficulty driven away.
Those therefore who are not yet possessed by the passion in question, I exhort not to be taken captive. For it is more easy to guard against falling into it, than having fallen to get away.
Source: Homilies on First Corinthians (New Advent)