Kingdom relationships are governed by truthfulness. Having integrity of speech by doing what you say, means that God is reigning in your heart. The emphasis of the commands of God regarding oaths in the Old Testament was on truthfulness and faithfulness. A person must be truthful when swearing an oath; one must truly mean it. Our word should be enough. When we say yes, that should be as binding as a vow. When we say no, someone should be able to take that to the bank, because our word is good.