ars longa, vita brevis

Latin phrase

ars lon·​ga, vi·​ta bre·​vis ärs-ˈlȯŋ-ˌgä ˌwē-ˌtä-ˈbre-wis 

: art is long, life is short : learning one's craft takes so long that a lifetime may not be adequate

also : works of art may outlive their creators