There is no kind of stupid quite like certainty.
Of course there is no kind of stupidity that in away resembles certainty,
for certainty when backed up by evidence is not stupid in any way, shape or form.
$2 + $2 = $4 You better be certain of that if you want to stay in business.
Are you certain about that?
I am certain of only one thing, and that one thing is that only one thing is certain.