Theory of a dead man

Although not my words, very interesting isn't it, if their dead that means they didn't get everything right, so do we pay attention to their theories, or not? after all we do not want to die. So should you take advice from people who make mistakes because they learned from them or from people who haven't made the mistake because they didn't do it in the first place. One errs on the side of foolish judgment and other bitter regret the other side foolish caution and still bitter regret. Is it better to do something and regret it, or not do something and regret that. Is it better to do something irreversible that you could regret forever or not do something because you know their is a possibility for less than a happy ending, how do we judge whether he experience is worth the risk if we never take action, how can we judge if the consequences were worth the action if we refuse to accept responsibility?

Is my theory worth more because I live, or does death lend you more credibility

incredibly alive

or credibly dead?