How does Lou Gehrigs farewell to baseball speech use constraints and resources to relate to the audience?

In Lou Gehrig's Farewell to Baseball, a short delivery he gave at Yankee Stadium on July 4, 1939. Gehrig acknowledge the sadness precipitated by his departure and also shores up some hope for his audience to act on in the future.

Gehrig gave a speech on how his illness does not override the fortune he has gained from the sport, being a world-class baseball player and celebrity. The purpose of his speech was to say final goodbye to a big part of his life. He had been on a baseball field most of his life.