&quot;The key to succesful education is involved parents. It&#x27;s really that simple.&quot; Given that statement, and translating it from layman terms (&quot;the key&quot; and &quot;really that simple&quot;) into philosophical terms (necessary and sufficient), I would say that tokenadult was fair in having that idea, that &quot;the key&quot; == &quot;sufficient&quot;.