At the level of the Church, the Hydra is heresy and error, which leads to apostasy. At the level of Society, the Hydra is error or ersatz religion, which always threatens to whelm organic growth. One might say, the State, in our day? The Hydra is a cancer, and it devours all that it feasts upon. Passions, heresy, the mega-State.....they offer us, at first, escape from our individuality and personhood, our discipline. They offer to initiate us in the multiplicity of delusion. And they consume.
A challenge to the modern Hyper-Calvinists and Meta-Protestant peoples of the world, the "new men without chests": http://www.catholicism.org/clement-maria-hofbauer.html
"Almost as a postscript to the heavenly warning issued at Fatima in 1917, Saint Maximilian Kolbe, two years later, reviewed the three Great Evils of the latter times, noting: "In 1517, the Protestants rebelled against the Church; in 1717, the Freemasons rebelled against Christ; and, in 1917, the Communists rebelled against God." In a single sentence the Polish martyr had exposed common origin and natural succession of each of these Apocalyptic nightmares."