As marmot said in his comment, you could use quote environment, to center it just use \centering:
\documentclass{article}
\begin{document}
As farah has written
\begin{quote}\centering
This question could be interesting to do \dots
\end{quote}
\end{document}
Since you have to do it many times, you could use:
\usepackage{etoolbox}
\AtEndEnvironment{quote}{\centering}
to center every quote environment without having to write \centering every time.
\documentclass{article}
\usepackage{etoolbox}
\AtEndEnvironment{quote}{\centering}
\begin{document}
As farah has written
\begin{quote}
This question could be interesting to do \dots
\end{quote}
\end{document}

But, as the commenters say, you probably need only quote without \centering:
\documentclass{article}
\begin{document}
As farah has written \begin{quote}
This question could be interesting to do \dots. But as all the commenters say, it is much better without \verb|\centering|!
\end{quote}
Something just to show you the way \verb|quote| environment works.
\end{document}

\centering:\begin{quote}\centering This question could be interesting to do .... \end{quote}? – CarLaTeX Feb 08 '19 at 05:30quote, no centering, because this is not a title. – egreg Feb 08 '19 at 10:13