While I unreservedly acknowledge the advantages of direct speech as
discussed by others, I would like to highlight one usage of the third
person, which seems not only stylistically permissible but also more
rigorous. "This paper states" might indicate the awareness of the author
that he/she presents a point from a particular angle, in particular
circumstances. Attributing the voice to his/her paper, the author might wish
to indicate the contingency and temporality of his/her opinion. Indeed,
today's I is very likely to disagree with tomorrow's I at least on some
issues. Hopefully.
Stanislav
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