The sentence that provides a summary of Gehrig's speech is: While Gehrig is going through something awful personally, his life is still rewarding, fulfilling, and worth living.
A summary is a highlight of the main points in a text. The main point in the text above is Gehrig's appreciation of the wonderful people in his life despite his bad personal condition.
He feels very happy and fulfilled to know all these people and to be cared for by them. And this knowledge helped him through his difficult times.
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