Actually this is a good advice and a big help also for those who lacks of knowledge , specifically to those who can't control their emotions when there's a bad scenario happen . But unfortunately opposite always happened nowadays which is they 're always panicking and ignore this kind of advice ,and always regrets as well. to be honest mate this advice will become useless because people nowadays are always struggled when it comes to controlling emotions.
You are so right... I fail too at times. We're humans so it's okay to make mistakes. But it's important to at least try and have discipline, this is what wins over making emotional decisions.
Yes, we must try to overcome failure, no one is a complete victory without fail once. But let's look at that failure is the mother of success, draw ourselves to us valuable lessons to be successful in the future.