Does this mean we should not take an oath in a court of law? I don't think so. This verse teaches us to be as good as our word in our every day relationships and communications.
Think About It
Our world is filled with lies and deceit. We can shine our light into this darkness by practicing honesty, integrity and trustworthiness. When people believe what we say and trust us to carry out our commitments, we won't have to back up our words with "I swear" or "I promise."
Pray About It
Father God, teach me to be honest and true as you are. Help me to build a godly character. In Jesus' name, Amen.