Yesterday I put out the quote “say what you mean and mean what you say.” Even though this famous saying is not in the Bible, you can argue that it’s Biblical.
The contrast to this quote is to “say what you don’t mean, and don’t mean what you say.” Yes, hypocrisy.
In both the Old Testament and New Testament sincerity is a sign of righteousness, and hypocrisy is a sign of wickedness. The “say what you mean” quote is based upon this truth out of the scriptures. In Matthew 5:33 Jesus quotes the Law in Leviticus saying, “Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform your oaths to the Lord’.” But then he continued that we should not swear at all:
“But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.” – Matthew 5:37 KJV. Or in other words, say what you mean.
This is underscored in the Book of James: “But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation. – James 5:12 KJV
If you say “yes”, then let it be “yes”. If you say “no”, then let it be “no”. Mean what you say, say what you mean. Otherwise, it is evil and leads to condemnation.