How do you know anything?

how do you know anything?
about the present created from images 
shaped by emotions and experience
or the future a synthesis 
of shredded images and the magic of desire
like standing on a cliff
with one foot barely on the edge
and the other out in space

where to live here or there
stay or go
is leaving new friends sadder
than watching old friends get sick
evoking end of life panic
trying to know is like
being buffeted by strong winds
standing on the top rung of a tall ladder
holding a card reading the words 
the statement on the other side of this card is false
then turning the card over reading
the statement on the other side of this card is true

in the wind 
the ladder sways precariously