You don’t see much of any path unless you are Janus, looking simultaneously backward and forward. - Frank Herbert

Abandon certainty! That's life's deepest command. That's what life's all about. We're a probe into the unknown, into the uncertain. Why can't you hear Muad'Dib? If certainty is knowing absolutely an absolute future, then that's only death disguised! Such a future becomes now!

If you focus your awareness only upon your own rightness, then you invite the forces of opposition to overwhelm you.

Leto turned a hard stare at Kynes.
And Kynes, returning the stare, found himself troubled by a fact he had observed here: This Duke was concerned more over the men than he was over the spice. He risked his own life, and that of his son to save the men. He passed off the loss of a spice crawler with a gesture. The threat to men's lives had him in a rage. A leader such as that would command fanatic loyalty. He would be difficult to defeat.
Against his own will and all previous judgements, Kynes admitted to himself: I like this Duke.