Writing several lines before chapter title

How can I get the style like:

chapter 1

bla bla bla bla ...

bla bla bla bla ...

A paragraph before chapter title --- this line is precisely on place where the first line of the other pages start.

the second line

chapter 2

bla bla bla bla ...

chapter 3

bla bla bla bla ...

This question is concerned with Why chapter label below the section label on new page even if by setting same spacing before title (use titlesec package)?

Edit (for Yiannis) Thanks. However, that isn't my demand. See below .

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Use the epigraph package.

Edit:

To remove unwanted space use \beforeepigraphskip=0pt. Here is a minimal:

\documentclass{book}  \usepackage[papersize={200pt,270pt}]{geometry}
\usepackage{epigraph}
\usepackage{titlesec} \titleformat{\chapter}{\Large\bfseries}{Ch. \thechapter}{0em}{} \titlespacing*{\chapter}{0pt}{0pt}{0pt}
\begin{document}
\chapter{abc}\beforeepigraphskip=0pt

Uncomment the \meaning\epigraph to see the macro for \epigraph. This method of debugging is normally quicker than reading through manuals for obvious situations like this.
@Yiannis: \epigraphhead[70]{\epigraph{paragraph}{}} coundn't put the paragraph precisely on place where the first line of the other pages start. –  dearmath May 19 '11 at 3:55
@dearmath It can be a setting for epigraph or due to topskip, try \topskip=0pt before you type the epigraph command. Even better post a minimal, if you still have a problem. –  Yiannis Lazarides May 19 '11 at 4:21
@Yiannis: \documentclass{book} \usepackage{epigraph} \usepackage[papersize={200pt,270pt}]{geometry} \usepackage{titlesec} \titleformat{\chapter}{\Large\bfseries}{Ch. \thechapter}{0em}{} \titlespacing*{\chapter}{0pt}{0pt}{0pt} \begin{document} \chapter{abc} \topskip=0pt\epigraphhead[20]{ \topskip=0pt\epigraph{paragraph}{a}} \newpage abc \end{document} How to choose the value of \epigraphhead's opt arg? i.imgur.com/x6Ggw.png –  dearmath May 19 '11 at 4:36
@dearmath Had a look at the package add \beforeepigraphskip=0pt. –  Yiannis Lazarides May 19 '11 at 9:29