§ 02 · King James Bible
Matthew 5:37
But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Simple English
But say only "yes" when you mean it, and "no" when you don't. Don't go beyond these two things, because anything more than that comes from badness.
* Work in progress - there may be occasional inaccuracies