One of the observations by someone who was present for the speech was, "its clarity, logic, and sincerity struck us." quote one example from the text that you would describe as clear, logical, or sincere. explain the language in your chosen quote correctly, and tell why it can be considered clear, logical, and sincere

This is preeminently the time to speak the truth, the whole truth, frankly and boldly.

This quote can be seen as clear, logical, and sincere. He is saying that it is time to speak the truth which shows sincerity. Also since it says that the whole truth should be spoken frankly. This connects to the idea that the speech was clear and logical. When someone speaks the truth frankly and bodly, they are doing it in a way that is clear and direct. It doesn't have any extra fluff or distracting information.