Do not use power to suppress opinions you think pernicious, for if you do the opinions will suppress you.
Who ever heard a theologian preface his creed, or a politician conclude his speech with an estimate of the probable error of his opinion?
There may be no good reasons for very many opinions that are held with passion.
Neither the Church nor modern public opinion condemns petting, provided it stops short at a certain point.
I can only say that, while my own opinions as to ethics do not satisfy me, other people's satisfy me still less.
Some `advanced thinkers' are of the opinion that anyone who differs from the conventional opinion must be in the right. This is a delusion; if it were not, truth would be easier to come by than it is.
Measures of sterilization should, in my opinion, be very definitely confined to persons who are mentally defective
The sentiments of an adult are compounded of a kernal of instinct surrounded by a vast husk of education.
I am not myself in any degree ashamed of having changed my opinions.
No opinion has ever been too errant to become a creed.
Public opinion is always more tyrannical towards those who obviously fear it than towards those who feel indifferent to it.
The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holders lack of rational conviction. Opinions in politics and religion are almost always held passionately.
Opinions which justify cruelty are inspired by cruel impulses.
It is clear that thought is not free if the profession of certain opinions makes it impossible to earn a living.
Freedom in education has many aspects. There is first of all freedom to learn or not to learn. Then there is freedom as to what to learn. And in later education there is freedom of opinion.