Idealogues are seldom beneficial to prosperity or to progress of any other sort. That seems almost a tautology. After all, if you know all the answers, what benefit is there in pursuing new ideas? Or, for that matter, letting others pursue them? If you have all the answers, "progress" is a waste of time.
The conundrum comes from the observation that having no answers does not lead to prosperity or to progress of any other sort. If you have none of the answers, what good do you do by trying anything new? Any choice you can makes, if you have none of the answers, is a shot in the dark, a grab in a bag, a random chance. The only certainty when you are uncertain is maintaining whatever you have, however good or bad it is.
To move forward, to make the world better in any way at all, you must first have some certainty about the direction in which you should move. Yet in order to continue to progress, you must be uncertain, enough unsure of yourself that you will reexamine and refine your tactics, your strategy, even your fundamental objectives.
The best position is not merely a middle ground between overconfidence and passive uncertainty. The best orientation, in actual reality, is actively reaching for true humility: knowing and owning your own true worth, and neither more nor less than that; knowing and granting the true worth of others, and neither more nor less than that.