One can prove or refute anything at all with words. Soon people will perfect language technology to such an extent that they'll be proving with mathematical precision that twice two is seven.
If there's a gun on the wall in act one, scene one, you must fire the gun by act three, scene two. If you fire a gun in act three, scene two, you must see the gun on the wall in act one, scene one.
...and with a burning pain in my heart I realized how unnecessary, how petty, and how deceptive all that had hindered us from loving was. I understood that when you love you must either, in your reasonings about that love, start from what is highest, from what is more important than happiness or unhappiness, sin or virtue in their accepted meaning, or you must not reason at all.
At the door of every happy person there should be a man with a hammer whose knock would serve as a constant reminder of the existence of unfortunate people.