when I was 18 years old, I had a promise with my friend to make a big amazing gift on her birthday. Unfortunately, I also had a meeting about my new job which I was going to apply it and I forgot her birthday. She waited for me all night and she got angry. At that time, she never talked to me and I lost one of my good friend because I could not keep my promise. For this reason, do not ever make our promise that we cannot keep it.