But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
εστω δε ο λογος υμων ναι ναι ου ου το δε περισσον τουτων εκ του πονηρου εστιν
Matthew 5:37
The same idea in other traditions
Keep thy tongue from evil, And thy lips from speaking guile.
Truth is higher than everything; but higher still is truthful living.
O ye who believe! Fear Allah, and (always) say a word directed to the Right:
Him I call indeed a Brâhmana who utters true speech, instructive and free from harshness, so that he offend no one.
By sincerity in religious practice he obtains proficiency in it; being proficient in it he will act up to his words.
The Master said, "Yu, shall I teach you what knowledge is? When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it;—this is knowledge."
The true prevails, not the untrue; by the true the path is laid out, the way of the gods (devayânah), on which the old sages, satisfied in their desires, proceed to where there is that highest place of the True One.