People Who Are More Abrasive Than I Am

John McCain (not very brief but worth the read; HT)

Athanasius:

But, as it seems, a heretic is a wicked thing in truth, and in every respect his heart is depraved and irreligious. for behold, though convicted on all points, and shewn to be utterly bereft of understanding, they feel no shame; but as the hydra of Gentile fable, when it former serpents were destroyed, gave birth to fresh ones, contending against the slayer of the old by the production of new, so also they, hostile and hateful to God, as hydras, losing their life in the objections which they advance, invent for themselves other questions Judaic and foolish, and new expedients, as if truth were their enemy, thereby to shew the rather that they are Christ's opponent in all things.

Second Discourse Against the Arians, Chapter XXX, §58.

And there's more where that came from. (Granted, he was responding to people who denied the deity of Christ so perhaps he deserves some slack.)