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This question already has an answer here:

I want to emphasize a certain part of a document by putting a box around it. Any help is much appreciated.

marked as duplicate by JPi, Zarko, Kurt, CarLaTeX, Stefan Pinnow Jun 17 '17 at 17:50

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The packages tcolorbox and mdframed are both nice for filled, colored and outstanding decorated boxes, but the question is asking IMHO for the Not So Short Introduction to LATEX2ε to start knowing basic commands as \fbox and environments as minipage:

mwe

\documentclass{article}
\setlength\parskip{1em}
\setlength\fboxsep{1em}
\begin{document}
    Bla bla bla ...\par % you can change \par by a blank line
    \fbox{
    \begin{minipage}{.3\linewidth}
        \setlength\parskip{1em}
        Bla bla bla ...\par
        And bla bla bla ...
    \end{minipage}}\par
    Bla bla bla ...
\end{document}

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