Leading at the edge Chapter 2 & 3

Chapter 2 "Symbolism and Personal Example"
In this Chapter, the author emphasizes the importance of setting the personal example with visible, memorable symbols and behaviors.

...Give the Right Speech
In this section, the crews praised Shackleton's speech. For example, "The speech had an immediate effect: our spirits rose, and we were inclined to take a more cheerful view of a situation that had nothing in it to warrant the alternation." (Frank Wild) I really want to hear the speech, so I searched it on the web.

Shackleton's original voice
(http://cylinders.library.ucsb.edu/mp3s/1000/1859/cusb-cyl1859d.mp3)

When I heard it, I felt like the tone of his voice or the style of his speech is similar to that of Martin Luther King.(this Shackleton's voice do not contain the message like him though)

I'm not sure what kind of thing Shackleton spoke in front of the crew during the adventure, but I would feel relieved if I were a part of the ship. That may be because Shackleton's voice seems to be calm and confident. What do you think about this??