Andrew Gleason
... that mathematician Andrew Gleason liked to say that proofs "really aren't there to convince you that something is true—they're there to show you why it is true"?
... that mathematician <b id="mwAtA"><a class="mw-redirect" href="./Andrew_Gleason" id="mwAtE" rel="mw:WikiLink" title="Andrew Gleason">Andrew Gleason</a></b> liked to say that <a href="./Mathematical_proof#Visual_proof" id="mwAtI" rel="mw:WikiLink" title="Mathematical proof">proofs</a> <i id="mwAtM">(example pictured)</i> "really aren't there to convince you that something is true<span id="mwAtQ" typeof="mw:Entity">—</span>they're there to show you <i id="mwAtU">why</i> it is true"?