You shall be careful to do what has passed your lips, for you have voluntarily vowed to the Lord your God what you have promised with your mouth.
It’s possible to wound your character and ding your integrity by becoming someone who is known for saying things you don’t follow through with. It does a great disservice to those who look up to you and certainly does not glorify God. What we say is important. If you want to be known as someone who is trustworthy and upright, your words need to be reliable.