“If you can’t say something nice, don’t say nothin’ at all.”
The saying is venerable, to be sure, but not old enough to merit inclusion in holy writ. They’re not the words of a prophet, they’re the words of a rabbit.
Nevertheless, to this generally prudent advice, I would add the following gentle suggestion for my fellow Christians when commenting on politics: If you can’t say something understandable, don’t say anything at all.