چون نیست ز هرچه هست جز باد به دست - خیام 

خیام رباعیات
رباعی شمارهٔ ۲۹
چون نیست ز هرچه هست جز باد به دست
چون هست به هرچه هست نقصان و شکست
انگار که هرچه هست در عالم نیست
پندار که هرچه نیست در عالم هست
Since nothing of what exists remains
and all that exist are nothingness-bound
then all that exist are as if they don't
and all that don't exist are as if they do
Khayyam is saying that there is no difference between existence and non-existence since they both have one fate