Where did Frederick Douglas say anyone was entitled to an audience? The speaker has a right to speak, but cannot demand others listen. The listener has a right

Where did Frederick Douglas say anyone was entitled to an audience? The speaker has a right to speak, but cannot demand others listen. The listener has a right to hear, but cannot demand others to speak. The speech he gives is amazing to read, he goes further: "Equally clear is the right to hear. To suppress free speech is a double wrong. It violates the rights of the hearer as well as those of the speaker. It is just as criminal to rob a man of his right to speak and hear as it would be to rob him of his money."