%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-8 on page I-181 in "csquotes --- Context-sensitive quotation marks".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

  \setlength\leftmargini{1.5em} % -- shorten quote indentation for example

%StartShownPreambleCommands
\usepackage{csquotes}
\SetBlockEnvironment{quotation}
%StopShownPreambleCommands

\begin{document}
He started his talk with the quotes
\blockquote[Umberto Eco][.]{Our life is
 full of empty  space}  and
\blockquote[Douglas Adams]{Space is big.
 You just won't believe how vastly, hugely,
 mind-bogglingly big it is. I mean, you
 may think it's a long way down the road to
 the chemist, but that's just peanuts to
 space \ldots}.  Later on he finished with
\blockquote[Albert Einstein]{God does not
  play \ldots}.
\end{document}