Sometimes we have weakness, habits and addictions that we find hard to stop because it's more like they have become our lifestyle or a part of us. We try to pray about it so we can change, but still go back to our vomit. It hurts, the guilt, the shame and the self injury it causes. So there is that point in life were we feel the only way is to say a vow about the consequences that should follow us if we repeat that habit or addiction. I tried that, I was a porn addictor. If I was nervous, happy, worried, bored, tired, alone etc any chance I had I would watch it. After am done came the guilt, shame, self hurt. I got born again many times to start afresh but it all failed till I decided to make a Vow that if I ever watched porn no man would ever want to date me. I was strong to keep the vow till the lust of the flesh got the best out of me, after breaking my vow, I cried to God for forgiveness and asked Him to cancel the consequences of what my broken vow would bring over my life. What am trying to say is not even a Vow can make one change, only by one being willing and obedient to do what the word of God tells us to do.