I am Mnemo!🐬
If you can speak effectively and authenically to a group of people, you can move mountains. Everyday examples could be school teachers, politicians, sales people, seminar holders, etc. And if you make it in a profession, someone might invite you to deliver an address or speech.
Some people deliver speeches from a script. Others perform from memory, based on keywords. Yet other improvise the whole speech, perhaps after ust thinking about it a little bit 30 minute in advance.
Sure, these days you can use an autocue. This is not for everyone.Reading from a script with the aim of getting the right response is the job for a professional actor. Most people will look less powerful delivering speeches from scripts than if delivered from memory - not word perfect, but using keyword.
Think of speeches in three steps: 1) Research, writing, editing 2) memorizing keywords, 3) delivering the speech.
Research and write your speech out in a fully written form. Edit the speech. Then divide parts and paragraphs into keywords and memorize the keywords. Check yourself, and note which parts you did not manage to remember with the keywords, and add others or use better keywords.
Say a speech has these keywords in the beginning:
These keywords could be more than enough to remember the intro Kennedy's speech "Ich Bin ein Berlier":
I am proud to come to this city as the guest of your distinguished Mayor, who has symbolized throughout the world the fighting spirit of West Berlin. And I am proud -- And I am proud to visit the Federal Republic with your distinguished Chancellor who for so many years has committed Germany to democracy and freedom and progress, and to come here in the company of my fellow American, General Clay, who -- who has been in this city during its great moments of crisis and will come again if ever needed. Two thousand years ago -- Two thousand years ago, the proudest boast was civis Romanus sum.1 Today, in the world of freedom, the proudest boast is "Ich bin ein Berliner."