The singer made the comments on his official website following the end of Take That's recent tour.
Williams said: "Well, I have (it seems) a mountain of songs to finish lyrics for... so many tunes are in good shape now. Maybe 30 knocking around and that's not including old ones that never made R.K.T.V.S.
"The future's bright... I'm looking at my most consistent album to date... I have a month to tie up loose ends lyric-wise. I will remember all your kind words about what my songs mean to you as I struggle for eight hours over one rhyming couplet... this seems to happen more and more often these days."
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Of Take That's stadium shows, Williams added: "We all rose to the occasion... and then some. We all took each other's thoughts and feelings into considering (sic)... then acted upon those feelings.
"We all loved each other to the best of our abilities. For one wet, wonderful summer we were five brothers bound together by the invisible strings that the universe conspires to pull when ready and when needed... and oh s**t, was it needed."
He continued: "We did exactly what we set out to achieve. Record selling... critically-acclaimed album.... check. Record-busting tour?... check. The ghost of Christmas past finally laid to rest... check!"
"This is my truth... anything else is white noise. Anything else doesn't exist. Demons battled? Battle won? Check... Given everything I have every night? Check... Letting in the love? Check.
"Knowing I did a good job? F**king check... Knowing now what it is I have? Check... Trusting it? Check... Wanting to go again...? Check... This is my truth... I/we/us won."
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Watch the video Robbie Williams posted on his official website below: