Chapter comment with regulation

Question

\documentclass[a4paper,11pt]{memoir}


\newenvironment{introduction}
{\centering%
  \begin{minipage}{.8\textwidth}%
%  \centering%
  \itshape\footnotesize\hspace{-1em}\ignorespaces%
}
{%
  \end{minipage}%
  \par\addvspace{2\baselineskip plus 0.2\baselineskip minus 0.2\baselineskip}%
}


\begin{document}
\begin{introduction}
Nunc condimentum, metus non ullamcorper fringilla, tellus tortor laoreet quam,
 eu pulvinar elit sem sed libero. Aliquam erat volutpat. Mauris sodales auctor
 turpis, nec convallis nisi auctor quis. Nunc rhoncus auctor dolor, malesuada
 posuere diam vestibulum scelerisque.
\end{introduction}
\end{document}

Answer 1

You can use \hangindent:

\documentclass[a4paper,11pt]{memoir}


\newenvironment{introduction}
{\centering%
  \begin{minipage}{.8\textwidth}%
  \itshape\footnotesize\ignorespaces\hangindent1em%
}
{%
  \end{minipage}%
  \par\addvspace{2\baselineskip plus 0.2\baselineskip minus 0.2\baselineskip}%
}


\begin{document}
\begin{introduction}
Nunc condimentum, metus non ullamcorper fringilla, tellus tortor laoreet quam,
 eu pulvinar elit sem sed libero. Aliquam erat volutpat. Mauris sodales auctor
 turpis, nec convallis nisi auctor quis. Nunc rhoncus auctor dolor, malesuada
 posuere diam vestibulum scelerisque.
\end{introduction}
Nunc condimentum, metus non ullamcorper fringilla, tellus tortor laoreet quam,
 eu pulvinar elit sem sed libero. Aliquam erat volutpat. Mauris sodales auctor
 turpis, nec convallis nisi auctor quis. Nunc rhoncus auctor dolor, malesuada
 posuere diam vestibulum scelerisque.

\end{document}