There is the first satisfaction of arranging it on a bit of paper; after many, many false tries, false moves, finally you have the sentence you recognize as the one you are looking for.

I knew I had fallen in love with Lolita forever; but I also knew she would not be forever Lolita.

The future is but the obsolete in reverse.

Above all, beware of platitudes, i.e., word combinations that have already appeared a thousand times.... As a general rule, try to find new combinations of words (not for the sake of their novelty, but because every person sees things in an individual way and must find his own words for them).

Let all of life be an unfettered howl.

I looked and looked at her, and I knew, as clearly as I know that I will die, that I loved her more than anything I had ever seen or imagined on earth. She was only the dead-leaf echo of the nymphet from long ago - but I loved her, this Lolita, pale and polluted and big with another man's child. She could fade and wither - I didn't care. I would still go mad with tenderness at the mere sight of her face.

Style and Structure are the essence of a book; great ideas are hogwash.