The quotation that was used by Einstein was primarily to appeal to the authority of a figure whom her audience is likely to respect.
A quote refers to a repeat of the speech of a person. It can also mean copying the word of another person or giving credit to a particular source.
In this case, the quotation used was to appeal to the authority of a figure whom her audience is likely to respect. It should be noted that people use quotes in order to support their arguments and hence convince their audience to agree to a particular point.
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