A man should always have these two rules in readiness. First, to do only what the reason of your ruling and legislating faculties suggest for the service of man. Second, to change your opinion whenever anyone at hand sets you right and unsettles you in an opinion, but this change of opinion should come only because you are persuaded that something is just or to the public advantage, not because it appears pleasant or increases your reputation.
Jane Gallagher had wanted to know what time it was, but for some reason Holden Caulfield hadn't wanted Stradlater to tell her. When Stradlater refused to tell Holden Caulfieldwhether or not he had told Jane Gallagher what time it was, Holden Caulfield became enraged and attacked him in a fit or horological savagery, possibly because he was mentally ill and hated anyone byt him knowing what time it was