This quote is attributed to WWII British pilot, Sir Douglas Bader. See http://en.wikipedia.org/wiki/Douglas_Bader, which cites a different original source, "'In Reach for the Sky,' this quote is attributed to Harry Day, the Royal Flying Corps First World War fighter ace."

It's also attributed to Oscar Wilde, but I couldn't find where. I Googled, and looked in the Oxford Book of Quotations before I realized I have too much time on my hands.