If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time a tremendous whack.
Source: On public speaking, quoted by Edward, Duke of Windsor, A King's Story, Putnam 51
-- Winston Churchill, (Nov 30 1874-1965), English statesman, author; He was prime minister, orator and author; inspired and rallied the British people during WW II.