Our mouths can get us into trouble. God permanently records our vows to him and to one another and calls those who do not keep their vows fools (Ecc 5:3). In fact scripture says he will destroy the work of their hands (Ecc 5:6).
Our vows and our words should be kept at a minimum. Though we should always weigh our words carefully because God takes them seriously, scripture assumes we will make vows.
God is worthy to receive our vows. They are to be given with prudence and to be done in the house of God. It is there we are most aware of his love for us and our commitment to him.