The 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.
XenophanesEven if a man should chance to speak the most complete truth, yet he himself does not know it; all things are wrapped in appearances
Xenophanes