In football, the intended goal of FC Barcelona is to be the best football team in the world. So they recruit and nurture the most talented players they can find, train them hard together and instill a hunger for victory in order to achieve that goal.
When you make your presentation in the board room or on the stage at an industry conference, even if you are not the Lionel Messi of Public Speaking, like Barcelona, you want to be clear about your message and your intended goals too.
How does this translate for you?
An intention is something that you plan to do or achieve.
A message is a short communication.
Your message is what you want your audience to take away when you stop talking. Your audience needs to realize that the message is a representation of your intended goal.
If your intention is to win the Champion's League, your message is to win each game, one by one, culminating in the Final.
If your intention is to win the war, your message is that you are invincible.
Message and intention must work hand in hand to influence your audience. One must support and lead to the completion of the other.
A speech that conveys only a message, but no intended goal, will have a much lesser impact on your audience than a speech whose intended goal is clear.
If you miss that goal, you might not qualify for the Champions League of public speaking.