During my class yesterday we discussed the problem of evil with some specific focus on the cause of the imperfections of finite beings. One of the problems with being imperfect is that we have failings that can very easily lead us to unhappiness.
A large part of the philosophical life is working towards dealing with such failings-at least those that relate to wisdom. This is a challenging thing even for professional philosophers. Perhaps it can be even harder for professionals-sometimes it is best to just do rather than to over-think matters.
In any case, I recently (perhaps ironically) had the opportunity to face one of my own failings and, sadly, I came up short. I do regret this. But, my philosophical nature has prevented the situation from being a complete loss. While we all make mistakes, it is far worse not to learn from them. We can never hope to be perfect, but we can learn to be better and not make the same mistake twice.
One mistake is a chance to learn, but two mistakes are a sign of foolishness. I do hope that I am no fool.