Section Numbering in Table of Contents but NOT in Document

Question

Apologies if this has already been asked and answered but I did do a fair amount of looking and couldn't find anything.

\documentclass{article}
\begin{document}
\tableofcontents
\section{Section One}
blah 
\subsection{Subsection One}
blah blah
\section{Section Two}
blah blah blah
\end{document}

All I want is for the above MWE to come out as (in the document itself):

Section One

blah

1.1 Subsection One

blah blah

Section Two

blah blah blah

... and in the table of contents:

1. Section One 1.1 Subsection One
2. Section Two

So basically, using:

\section*{Section One}
\subsection{Subsection One}
\section*{Section Two}

... works for what I want for the document itself (i.e. using asterisks with the sections but not with the subsections), but this does not work with the table of contents. I still want the numbers in the table of contents, and no matter what I do with \addtocontents or \addcontentsline{toc}{section}{} etc., nothing seems to work.

Any help would be greatly appreciated.

EDIT To those saying this is confusing, I just want the numbering to be absent in the main document for the SECTION, NOT the subsections (and subsubsections etc.), of which there are many. This is because I want there to be a Section followed by a quote, followed by a bunch of (numbered) subsections in the main document ... but I still want the TOC to have the numbering for the Sections. I am well aware that the "book" class is probably easier for this, but I want to use article for other features.

Answer 1

REVISED

\documentclass{article}
\newcommand\Decide[1]{#1}
\makeatletter
\def\sectionsuffix      {}
\def\subsectionsuffix   {\quad}
\def\subsubsectionsuffix{\quad}
\def\paragraphsuffix    {\quad}
\renewcommand\@seccntformat[1]{\csname the#1\endcsname\csname#1suffix\endcsname}
\renewcommand\thesection{\protect\Decide{\@arabic\c@section}}
\renewcommand\thesubsection{\@arabic\c@section.\@arabic\c@subsection}
\makeatother
\begin{document}
\tableofcontents
\renewcommand\Decide[1]{}

\section{Section One}
blah 
\subsection{Subsection One}
blah blah
\section{Section Two}
blah blah blah
\end{document}

ORIGINAL APPROACH

I don't recommend it, because it is very confusing.

The macro \@seccntformat sets the appearance of the section numbering. So here, after the \tableofcontents, I nullify the macro, so that no formatting is done on the section numbering.

\documentclass{article}
\begin{document}
\tableofcontents
\makeatletter
\renewcommand\@seccntformat[1]{}
\makeatother
\section{Section One}
blah 
\subsection{Subsection One}
blah blah
\section{Section Two}
blah blah blah
\end{document}

Answer 2

You could use something like this, but i am not sure if it is what you want:

\begin{document}
\tableofcontents
\section*{Section 1}
\addcontentsline{toc}{section}{Section 1}
\addtocounter{section}{1}
blah
\subsection{Subsection 1}
blah blah
\section{Section 2}
blah blah
\end{document}

which would result in this:

Answer 3

This is very easy using KOMA-Script class scrartcl. If you want, you can change the defaults of the class to look like standard class article:

\documentclass[emulatestandardclasses]{scrartcl}% emulate article with scrartcl
\renewcommand*{\sectionformat}{}% dont show section numbers in section heading
\begin{document}
\tableofcontents
\section{Section One}
blah 
\subsection{Subsection One}
blah blah
\section{Section Two}
blah blah blah
\end{document}

Result:

If you also don't want the section number in a running head (page style headings) you can add:

\renewcommand*{\sectionmarkformat}{}