William Butler Yeats ( 13 June 1865 – 28 January 1939) was an Irish poet and playwright, and one of the foremost figures of 20th century literature. A pillar of both the Irish and British literary establishments. In 1923 he was awarded the Nobel Prize in Literature,as the first Irishman so honoured for what the Nobel Committee described as "inspired poetry, which in a highly artistic form gives expression to the spirit of a whole nation." Yeats is generally considered one of the few writers who completed their greatest works after being awarded the Nobel Prize.
Do not wait to strike till the iron is hot; but make it hot by striking.
As you go through life, you've got to see the valleys as well as the peaks.