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human
[LOTR] Why can't Gandalf fight at full power?

He tries to stop Sauron, but not with his full power. This seems a little bit strange to me, because he is clearly for the "good" side.
gpt
He is forbidden to use his full power to fight Sauron or his forces. The wizards were sent to Middle-earth to help the people fight against Sauron, not win their battles for them.

Edit: Gandalf however, can and does, fight all out against the Balrog since he does not serve Sauron. They fight for 10 days nonstop.