I am of the opinion that my life belongs to the whole community and as I live it is my privilege to do for it whatsoever I can. I want to be thoroughly used up when I die, for the harder I work the more I live. I rejoice in life for its own sake. Life is no “brief candle” to me; it is a sort of splendid torch which I’ve got a hold of for the moment and I want to make it burn as brightly as possible before handing it on to future generations.

George Bernard Shaw (1856-1950) British playwright and critic

“Art and Public Money,” speech, Municipal Technical College and School of Art, Brighton (1907-03-06)
    (Source)

This is the "official" version that shows up in Archibald Henderson, George Bernard Shaw: His Life and Works, ch. 16 (1911), as the final words. A variant version from the reporter's notes was published in the Sussex Daily News (1907-03-07):

I consider my life belongs to the whole community, and while I last it is my privilege to do what I can for it. I want to be worn out, because the harder I am working, the more I live. I enjoy like for its own sake. It is no "brief candle" for me. It is a sort of glorious torch, which I have got the hold of for the moment, and I want to make it blaze brighter before I hand it on to future generations.

For the "brief candle" reference, see Shakespeare.

This passage is sometimes quoted incorrectly preceded by a passage in the "Epistle Dedicatory to Archibald Henderson" to Man and Superman (1903). This error may have come from Stephen Covey, who identified the chimera as one of his favorite quotations.