I came across the following gem in the Enchiridion of the Stoic philosopher Epictetus:
If someone brags because he understands the books of Chrysippus and can explain them, say to yourself: “If Chrysippus had not written unclearly, this fellow would have nothing to brag about.” (49)
For further comic effect, try replacing ‘Chrysippus’ with the name of almost any celebrated modern theologian.