By physical liberty I mean the right to do anything which does not interfere with the happiness of another. By intellectual liberty I mean the right to think and the right to think wrong.
I am the inferior of any man whose rights I trample under foot.
Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul.
The real searcher after truth will not receive the old because it is old, or reject the new because it is new. He will not believe men because they are dead, or contradict them because they are alive. With him an utterance is worth the truth, the reason it contains, without the slightest regard to the author. He may have been a king or serf -- a philosopher or servant, -- but the utterance neither gains nor loses in truth or reason. Its value is absolutely independent of the fame or station of the man who gave it to the world.
What light is to the eyes – what air is to the lungs – what love is to the heart, liberty is to the soul of man. Without liberty, the brain is a dungeon, where the chained thoughts die with their pinions pressed against the hingeless doors.
Every man is dishonest who lives upon the labor of others, no matter if he occupies a throne.
Most men are followers, and implicitly rely upon the judgment of others. They mistake solemnity for wisdom, and regard a grave countenance as the title page and Preface to a most learned volume. So they are easily imposed upon by forms, strange garments, and solemn ceremonies. And when the teaching of parents, the customs of neighbors, and the general tongue approve and justify a belief or creed, no matter how absurd, it is hard even for the strongest to hold the citadel of his soul. In each country, in defence of each religion, the same arguments would be urged.
Intellectual liberty is the air of the soul, the sunshine of the mind, and without it, the world is a prison, the universe is a dungeon.
All the martyrs in the history of the world are not sufficient to establish the correctness of an opinion. Martyrdom, as a rule, establishes the sincerity of the martyr, — never the correctness of his thought. Things are true or false in themselves. Truth cannot be affected by opinions; it cannot be changed, established, or affected by martyrdom. An error cannot be believed sincerely enough to make it a truth.
There are in nature neither rewards nor punishments - there are only consequences.
The man who does not do his own thinking is a slave, and is a traitor to himself and his fellow men.
Courage without conscience is a wild beast.
Love is the only bow on Life's dark cloud. It is the morning and the evening star. It shines upon the babe, and sheds its radiance on the quiet tomb. It is the mother of art, inspirer of poet, patriot and philosopher. It is the air and light of every heart -- builder of every home, kindler of every fire on every hearth. It was the first to dream of immortality. It fills the world with melody -- for music is the voice of love. Love is the magician, the enchanter, that changes worthless things to Joy, and makes royal kings and queens of common clay. It is the perfume of that wondrous flower, the heart, and without that sacred passion, that divine swoon, we are less than beasts; but with it, earth is heaven, and we are gods.
There is no slavery but ignorance.
Liberty is the child of intelligence.
Give to every human being every right that you claim for yourself.
It is incredible that only idiots are absolutely sure of salvation. It is incredible that the more brain you have the less your chance is. There can be no danger in honest thought, and if the world ever advances beyond what it is to-day, it must be led by men who express their real opinions.
Heresy is what the minority believe; it is the name given by the powerful to the doctrines of the weak.
If there is a God who will damn his children forever, I would rather go to hell than to go to heaven and keep the society of such an infamous tyrant. I make my choice now. I despise that doctrine. It has covered the cheeks of this world with tears. It has polluted the hearts of children, and poisoned the imaginations of men. It has been a constant pain, a perpetual terror to every good man and woman and child. It has filled the good with horror and with fear; but it has had no effect upon the infamous and base. It has wrung the hearts of the tender, it has furrowed the cheeks of the good. This doctrine never should be preached again. What right have you, sir, Mr. clergyman, you, minister of the gospel to stand at the portals of the tomb, at the vestibule of eternity, and fill the future with horror and with fear? I do not believe this doctrine, neither do you. If you did, you could not sleep one moment. Any man who believes it, and has within his breast a decent, throbbing heart, will go insane. A man who believes that doctrine and does not go insane has the heart of a snake and the conscience of a hyena.
The Emperor Constantine, who lifted Christianity into power, murdered his wife Fausta, and his eldest son Crispus, the same year that he convened the Council of Nice to decide whether Jesus Christ was a man or the Son of God. The council decided that Christ was consubstantial with the father. This was in the year 325. We are thus indebted to a wife-murderer for settling the vexed question of the divinity of the Savior.
There will never be a generation of great men until there has been a generation of free women -- of free mothers.