In the case of Chief Tecumseh's speech, it contributes to the overall strength of the statement by reinforcing the central themes and ideals in a memorable and compelling way.
The reference to Chief Tecumseh likely alludes to his famous speech, often attributed to him but more accurately credited to his brother Tenskwatawa, also known as the Prophet. The speech is often quoted for its eloquence and powerful rhetoric, and it includes a notable example of parallel structure:
"So live your life that the fear of death can never enter your heart. Trouble no one about their religion; respect others in their view, and demand that they respect yours. Love your life, perfect your life, beautify all things in your life. Seek to make your life long and its purpose in the service of your people."