Take off your old gray bonnet and throw away those rubber stamps. Clean out the old moth eaten expressions. Give your own friendly personality a chance. Let your letters talk as you would talk. These are the first great essentials in the writing of a good business letter," according to L. E. Frailey in his book, "Smooth Sailing Letters." It is surprising how many people give the impression of great charm in a conversation but become stilted and formal in a letter.