Preparation

Crying over spilled milk won't help you. Remember, every milk on the ground has its story how it was spilled. And most of us don't even reflect our errors and mistakes. Simply because it is not so pleasant as to bask in our successes. Professional chess players know this well (works for any competition, really) - analyze your lost games. Victories are not so important. Wisdom can't be learnt, only gained... and exactly from this. From the spilled milk.
That said, I don't believe we should act like there is no tomorrow. Responsibility and consequences, especially of other human being weighs heavily upon us. While we are not bound to be slaves of altruism, categorically there is a golden rule of ethics we should follow to maintain sane stability in this universe. This rule is a subject to flexibility, but nevertheless, it is still a rule.
When they laugh at oracles and mentalists, I get it. Yet they do not realize, that humans can really predict. It is not a magic. Not a psi phenomena. It simply is. Let's call it instinct. The less you think about your predictions, the more are paradoxically true. How does it work? I cannot say. But it saved my life plenty of times. The most noble and known label of this thing is "intuition", stereotypically bolted into the females, but really it is in every person. Some listen to it, some don't. Some have even trained to shout so loud in their head that it practically cannot be heard and intuition becomes false intuition. Know this, the most pure, quickest and simplest call from the subconsciousness, that is most of the time what we are seeking. Let's all learn to listen to that voice. We will be prepared.
And if not, at least we learn something new.