“The man who does not do his own thinking is a slave, and is a traitor to himself and to his fellow-men.”
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.
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Robert G. Ingersoll 439
Union United States Army officer 1833–1899Related quotes
Torture and Resistance in Iran, 1971

Majlisi, Bihārul Anwār, vol.78, p. 335.
Religious Wisdom

Farewell, p. 454
1920s, An Autobiography (1927)
Context: To see the universal and all-pervading Spirit of Truth face to face one must be able to love the meanest of creation as oneself. And a man who aspires after that cannot afford to keep out of any field of life. That is why my devotion to Truth has drawn me into the field of politics; and I can say without the slightest hesitation, and yet in all humility, that those who say that religion has nothing to do with politics do not know what religion means.
Identification with everything that lives is impossible without self-purification; without self-purification the observance of the law of Ahimsa must remain an empty dream; God can never be realized by one who is not pure of heart. Self-purification therefore must mean purification in all the walks of life. And purification being highly infectious, purification of oneself necessarily leads to the purification of one's surroundings.
But the path of self-purification is hard and steep. To attain to perfect purity one has to become absolutely passion-free in thought, speech and action; to rise above the opposing currents of love and hatred, attachment and repulsion. I know that I have not in me as yet that triple purity, in spite of constant ceaseless striving for it. That is why the world's praise fails to move me, indeed it very often stings me. To conquer the subtle passions seems to me to be far harder than the physical conquest of the world by the force of arms. Ever since my return to India I have had experiences of the dormant passions lying hidden within me. The knowledge of them has made me feel humiliated though not defeated. The experiences and experiments have sustained me and given me great joy. But I know that I have still before me a difficult path to traverse. I must reduce myself to zero. So long as a man does not of his own free will put himself last among his fellow creatures, there is no salvation for him. Ahimsa is the farthest limit of humility.

Source: The Montessori Method (1912), Ch. 5 : Discipline, p. 100.
Context: Let us picture to ourselves a clever and proficient workman, capable, not only of producing much and perfect work, but of giving advice in his workshop, because of his ability to control and direct the general activity of the environment in which he works. The man who is thus master of his environment will be able to smile before the anger of others, showing that great mastery of himself which comes from consciousness of his ability to do things. We should not, however, be in the least surprised to know that in his home this capable workman scolded his wife if the soup was not to his taste, or not ready at the appointed time. In his home, he is no longer the capable workman; the skilled workman here is the wife, who serves him and prepares his food for him. He is a serene and pleasant man where he is powerful through being efficient, but is domineering where he is served. Perhaps if he should learn how to prepare his soup he might become a perfect man! The man who, through his own efforts, is able to perform all the actions necessary for his comfort and development in life, conquers himself, and in doing so multiplies his abilities and perfects himself as an individual.
We must make of the future generation, powerful men, and by that we mean men who are independent and free.

283 http://books.google.com/books?id=_GLTsGHUxDgC&lpg=PA171&dq=Today%20as%20always%2C%20men%20fall%20into%20two%20groups&pg=PA171#v=onepage&q&f=false
Human, All Too Human (1878)

“It seems to be a fact that man, tortured by his demons, avenges himself blindly on his fellow-man.”
Source: Letters to Milena

“The young man who joins a political party is a traitor to his generation and to his race.”
For My Legionaries: The Iron Guard (1936), Politics