monumentum aere perennius

Latin quotation from Horace

mo·​nu·​men·​tum ae·​re per·​en·​ni·​us ˌmȯ-nu̇-ˈmen-tu̇m-ˌī-re-pe-ˈre-nē-u̇s 

: a monument more lasting than bronze

—used of an immortal work of art or literature