No human being will ever know the truth, for even if they happen to say it by chance, they would not even know they had done so.
XenophanesThe sea is the source of water and the source of wind; for neither would blasts of wind arise in the clouds and blow out from within them, except for the great sea, nor would the streams of rivers nor the rain-water in the sky exist but for the sea ; but the great sea is the begetter of clouds and winds and rivers.
Xenophanes