[Ulti]

No you should strongly reason and believe in your own power of reasoning, but you should never dogmatically hold on to those beliefs in the light of new evidence that contravenes your previous ideas. Essentially all scientists that are even vaguely good follow this ideal. You have to know what is opinion from fact, facts dont change but your opinion about them does. Opinion guides generation of new facts. If you dont have strong opinions then you wont have the dedication to generate new fact. Look at the more zany side of religion, its strong opinion strongly held. They aren't capable of change and generation of new ideas. But if you were forever lacking in an opinion you also wouldn't action on anything and have some kind of existential nihilism all the time.