If you want to hear an example, listen to a department store demonstrator repeat her memorized lingo about the newest furniture polish or breakfast food. It requires training to make a memorized speech sound fresh and spontaneous, and, unless you have a fine native memory, in each instance the finished product necessitates much labor. Should you forget a part of your speech or miss a few words, you are liable to be so confused that, like Mark Twain's guide in Rome, you will be compelled to repeat your lines from the beginning.
On the other hand, you may be so taken up with trying to recall your written words that you will not abandon yourself to the spirit of your address, and so fail to deliver it with that spontaneity which is so vital to forceful delivery.
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