a small cog in a large machine

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a small cog in a large machine

Someone or something that is functionally necessary but of small significance or importance within a larger operation or organization. I'm tired of working in this thankless IT support job. I don't want to be just a small cog in a large machine anymore!
See also: cog, large, machine, small
References in classic literature ?
I know no station which has a right to monopolise the means of mutual instruction, improvement, and rational entertainment; or which has ever continued to be a station very long, after seeking to do so.