“Again, you have heard that it was said to the people long ago, “Do not break your oath, but keep the oaths you have made to the Lord.” But I tell you, Do not swear at all: either by heaven, for it is God’s throne; or by the earth, for it is his footstool; or by Jerusalem, for it is the city of the Great King. And do not swear by your head, for you cannot make even one hair white or black. Simply let your “Yes” be “Yes,” and your “No,” “No”; anything beyond this comes from the evil one.” (Reference: Matthew 5:33-37 )
Why? Why is anything more than a simple yes or no evil? It has to do with in part, I think, human nature. It is part of human nature (or at least part of some people’s human nature) when they lie to be more adamant then when telling the truth. The bigger the promise or guarantee, the greater the chance there is something faulty or fishy with it.
The other reason, I think, has to do with what the oath was made upon, or sworn by. And again, human nature. Human nature can be weak and the best and most sincere of promises can be broken . . . or at least bent. And if you have sworn by something that is immovable or unshakable, like God’s throne or any of the other guarantors and then break that promise you have defiled what ever you have sworn with or upon. And that does not bode well for your immortal soul. So, let your “yes” and “no” be simple and plain, and your promises be straightforward. God knows the true intent of your heart and the reliability of your soul. You don’t need any other guarantor than that! Selah!