Reflecting on my failures over the past two years, it ultimately boils down to a few reasons:
1. Laziness, not diligent enough
2. Arrogance, unwilling to review and reflect
3. Cowardice, not daring to bravely try new things
You see, the reasoning is quite simple; it's just that some people realize their mistakes and are brave enough to correct themselves. Some people realize their mistakes but do not want to change, and some people are unaware of their mistakes, thinking that everything they do is right.