Besides, are you sure you've never used such a phrase without thinking about it? "Let he who is without sin cast the first stone." I'm sure you'd much rather "do unto others as you would have them do unto you". So maybe just be a charitable "Good Samaritan" and "turn the other cheek", even if you don't really like it, then. After all, "an eye for an eye" policy is fairly unpleasant.
Oh, who am I kidding? I'm just "casting pearls before swine" with this audience. (And being as foolish as "the prodigal son", at that.) I can see that "the writing is on the wall," and I won't get anywhere with anyone on this topic. I'll probably even get downvoted for this, but oh well. "Sow the wind" and "reap the whirlwind" as they say. (Hacker News really can be "the blind leading the blind" sometimes.)
You may personally appreciate it, but suppose he had been quoting different religions texts. Say the need to nourish Mayan gods using sacrificial blood.
Compare and contrast it with Lemon v. Kurtzman
While sourced from the Bible, it has a secular-enough meaning that I wouldn't stress it.