FOREWORD
foreword (序文) [名] a short introduction to a book, typically by someone other than the author
序文

 This little treatise is part of a longer work which I began years ago without realising my limitations, and long since abandoned.
little (小) [形] small in size
treatise (論文) [名] a formal and systematic written work on a particular subject
part (一部) [名] a piece or portion of something
long (長い) [形] having a great distance or duration
work (作品) [名] a product of artistic or intellectual effort
begin (書き始める) [動] start to do something
year (何年も前) [名] a period of 365 or 366 days
ago (前に) [副] earlier; previously
limitation (限界) [名] a lack of ability or strength
realise (悟る) [動] become fully aware of
long (長い間) [副] for a long time
abandon (放置する) [動] leave and never return to
この小論文は、私が何年も前に自分の限界を悟らずに書き始め、長い間放置していた長編作品の一部である。
Of the various fragments that might have been extracted from what I wrote, this is the most considerable, and, I think, the least unworthy of being offered to the public.
various (様々な) [形] more than one; several
fragment (断片) [名] a small part broken off or separated from something
extract (抜粋する) [動] remove or take out
write (書く) [動] mark (letters, words, or other symbols) on a surface, typically paper, with a pen, pencil, or similar implement
considerable (かなりの) [形] notably large in size, amount, or extent
think (思う) [動] have a particular opinion, belief, or idea about someone or something
least (最も少なく) [形] smallest in amount, extent, or significance
unworthy (値しない) [形] not good enough for someone or something
public (公) [名] the people as a whole
私が書いたものから抜粋された様々な断片の中で、これは最も重要なものであり、また、公に提供するに値しないものではないと思う。
The rest no longer exists.
rest (残り) [名] the remaining part
no longer (もはや) [副] not any more; not now
exist (存在する) [動] have objective reality or being
残りはもはや存在しない。