Striving to the utmost one's whole life

Just watched PBS's "Mount Rushmore" which has the gigantic 18m-tall carved facial sculptures of four exalted U.S presidents. What it impressed me is their sculptor, Gutzon Borglum, who basically prosecuted this impossible project driven by his love of art and strong-willed endeavor. During the 14-year period in the throes of both Great Depression and WWII, he basically completed this mission impossible and died seven months before the last carving was done. Striving to the utmost one's whole life (鞠躬盡瘁死而後已)