“The young man who joins a political party is a traitor to his generation and to his race.”

Source: The Liberty of Man, Woman and Child (1877)
Context: Only a few years ago there was a great awakening of the human mind. Men began to inquire by what right a crowned robber made them work for him? The man who asked this question was called a traitor. Others asked by what right does a robed hypocrite rule my thought? Such men were called infidels. The priest said, and the king said, where is this spirit of investigation to stop? They said then and they say now, that it is dangerous for man to be free. I deny it. Out on the intellectual sea there is room enough for every sail. In the intellectual air there is space enough for every wing.
The man who does not do his own thinking is a slave, and is a traitor to himself and to his fellow-men.

Act II, Scene i
The Foresters, Robin Hood and Maid Marion (1892)

Speech to the Virginia Convention (1861)
Context: These are pregnant statements; they avow a sentiment, a political principle of action, a sentiment of hatred to slavery as extreme as hatred can exist. The political principle here avowed is, that his action against slavery is not to be restrained by the Constitution of the United States, as interpreted by the Supreme Court of the United States. I say, if you can find any degree of hatred greater than that, I should like to see it. This is the sentiment of the chosen leader of the Black Republican party; and can you doubt that it is not entertained by every solitary member of that same party? You cannot, I think. He is a representative man; his sentiments are the sentiments of his party; his principles of political action are the principles of political action of his party. I say, then; it is true, at least, that the Republican party of the North hates slavery.

As quoted in May I Quote You, General Forrest? by Randall Bedwell.
1860s

Speech to the Conservative Party conference http://www.theguardian.com/politics/2002/oct/07/conservatives2002.conservatives1 (07 October 2002)

The Petersburg men had written Douglass seeking advice about supporting John M. Langston as their Republican candidate for Congress. He would be their first black representative, but earlier he had worked against the Republican party. Douglass called him a trickster and said not to support anyone "whose mad ambition would imperil the success of the Republican party."
1880s, Letter to the Men of Petersburg (1888)

Source: Autobiography of Andrew Carnegie, 1920, Chapter III

Radio adress (January 13, 1953), as quoted in Philip Short (2004) Pol Pot: The History of a Nightmare, page 83.

quoted in Madhu Purnima Kishwar: Modi, Muslims and Media. Voices from Narendra Modi’s Gujarat, Manushi Publications, Delhi 2014.