Finally losing it

In trying to say something to John, I've just come out with this bewildering aphorism: "let him who is without stone cast the first greenhouse".

Now, I know what I meant, but I doubt whether anyone else would, and I've decided that the last miserable wits are finally trickling out of my poor wretched head. Worrying isn't it? Well, it certainly worries me.

Is this kind of thing happening to anyone else?