The most detestable wickedness, the most horrid cruelties, and the greatest miseries, that have afflicted the human race have had their origin in this thing called revelation, or revealed religion. ... Whence arose all the horrid assassinations of whole nations of men, women, and infants, with which the Bible is filled; and the bloody persecutions, and tortures unto death and religious wars, that since that time have laid Europe in blood and ashes; whence arose they, but from this impious thing called revealed religion, and this monstrous belief that God has spoken to man?...
Some Christians pretend that Christianity was not established by the sword; but of what period of time do they speak? It was impossible that twelve men could begin with the sword: they had not the power; but no sooner were the professors of Christianity sufficiently powerful to employ the sword than they did so, and the stake and faggot too; and Mahomet could not do it sooner.... Besides this, Christianity grounds itself originally upon the [Hebrew] Bible, and the Bible was established altogether by the sword, and that in the worst use of it -- not to terrify, but to extirpate. The Jews made no converts: they butchered all. The Bible is the sire of the [New] Testament, and both are called the word of God. The Christians read both books; the ministers preach from both books; and this thing called Christianity is made up of both. It is then false to say that Christianity was not established by the sword.
The only sect that has not persecuted are the Quakers; and the only reason that can be given for it is, that they are rather Deists than Christians. They do not believe much about Jesus Christ, and they call the scriptures a dead letter. Had they called them by a worse name, they had been nearer the truth. It is incumbent on every man who reverences the character of the Creator, and who wishes to lessen the catalogue of artificial miseries, and remove the cause that has sown persecutions thick among mankind, to expel all ideas of a revealed religion as a dangerous heresy, and an impious fraud. What is it that we have learned from this pretended thing called revealed religion? Nothing that is useful to man, and every thing that is dishonourable to his Maker....
As to the fragments of morality that are irregularly and thinly scattered in those books, they make no part of this pretended thing, revealed religion. They are the natural dictates of conscience, and the bonds by which society is held together, and without which it cannot exist; and are nearly the same in all religions, and in all societies. The [New] Testament teaches nothing new upon this subject, and where it attempts to exceed, it becomes mean and ridiculous....
Loving of enemies is another dogma of feigned morality, and has besides no meaning. It is incumbent on man, as a moralist, that he does not revenge an injury; and it is equally as good in a political sense, for there is no end to retaliation;... but to love in proportion to the injury, if it could be done, would be to offer a premium for a crime. Besides, the word enemies is too vague and general to be used in a moral maxim, which ought always to be clear and defined, like a proverb. If a man be the enemy of another from mistake and prejudice, as in the case of religious opinions, and sometimes in politics, that man is different to an enemy at heart with a criminal intention; and it is incumbent upon us, and it contributes also to our own tranquillity, that we put the best construction upon a thing that it will bear. But even this erroneous motive in him makes no motive for love on the other part; and to say that we can love voluntarily, and without a motive, is morally and physically impossible.
Morality is injured by prescribing to it duties that, in the first place, are impossible to be performed, and if they could be would be productive of evil; or, as before said, be premiums for crime. The maxim of doing as we would be done unto does not include this strange doctrine of loving enemies; for no man expects to be loved himself for his crime or for his enmity.
Those who preach this doctrine of loving their enemies, are in general the greatest persecutors, and they act consistently by so doing; for the doctrine is hypocritical, and it is natural that hypocrisy should act the reverse of what it preaches. For my own part, I disown the doctrine, and consider it as a feigned or fabulous morality; yet the man does not exist that can say I have persecuted him, or any man, or any set of men, either in the American Revolution, or in the French Revolution; or that I have, in any case, returned evil for evil. But it is not incumbent on man to reward a bad action with a good one, or to return good for evil; and wherever it is done, it is a voluntary act, and not a duty.