Opinions alter, manners change, creeds rise and fall, but the moral law is written on the tablets of eternity.

But every difference of opinion is not a difference of principle.

It is the man of science, eager to have his every opinion regenerated, his every idea rationalized, by drinking at the fountain of fact, and devoting all the energies of his life to the cult of truth, not as he understands it, but as he does not yet understand it, that ought properly to be called a philosopher.

Truth gains more even by the errors of one who, with due study and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think?

I'm more than ever of the opinion that a decent human existence is possible today only on the fringes of society, where one then runs the risk of starving or being stoned to death. In these circumstances, a sense of humor is a great help.

The modern habit of saying "This is my opinion, but I may be wrong" is entirely irrational. If I say that it may be wrong, I say that is not my opinion. The modern habit of saying "Every man has a different philosophy; this is my philosophy and it suits me" ? the habit of saying this is mere weak-mindedness. A cosmic philosophy is not constructed to fit a man; a cosmic philosophy is constructed to fit a cosmos. A man can no more possess a private religion than he can possess a private sun and moon.

Eccentricity is not, as some would believe, a form of madness. It is often a kind of innocent pride, and the man of genius and the aristocrat are frequently regarded as eccentrics because genius and aristocrat are entirely unafraid of and uninfluenced by the opinions and vagaries of the crowd.

In my opinion, our health care system has failed when a doctor fails to treat an illness that is treatable.

In this age, the mere example of non-conformity, the mere refusal to bend the knee to custom, is itself a service. Precisely because the tyranny of opinion is such as to make eccentricity a reproach, it is desirable, in order to break through that tyranny, that people should be eccentric. Eccentricity has always abounded when and where strength of character has abounded; and the amount of eccentricity in a society has generally been proportional to the amount of genius, mental vigor, and moral courage which it contained. That so few now dare to be eccentric, marks the chief danger of the time.

If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.

It is clear that the individual who persecutes a man, his brother, because he is not of the same opinion, is a monster.

When another blames you or hates you, or people voice similar criticisms, go to their souls, penetrate inside and see what sort of people they are. You will realize that there is no need to be racked with anxiety that they should hold any particular opinion about you.

Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.

Stupidity is much the same all the world over. A stupid person's notions and feelings may confidently be inferred from those which prevail in the circle by which the person is surrounded. Not so with those whose opinions and feelings are an emanation from their own nature and faculties.

I was watching a collection of vintage '80s cereal commercials when I paused to wonder why cereal manufacturers no longer included toy prizes inside every box. It was a tragedy, in my opinion. Another sign that civilization was going straight down the tubes.

In a series of events, all of which had been a bit thick, this, in his opinion, achieved the maximum of thickness.

He couldn't see why people made such a fuss about people eating their silly old fruit anyway, but life would be a lot less fun if they didn't. And there was never an apple, in Adam's opinion, that wasn't worth the trouble you got into for eating it.

Everyone has a sense of humor. If you don't laugh at jokes, you probably laugh at opinions.

My opinions may have changed, but not the fact that I'm right.

My own opinion is enough for me, and I claim the right to have it defended against any consensus, any majority, anywhere, any place, any time. And anyone who disagrees with this can pick a number, get in line, and kiss my ass.

Red hair, sir, in my opinion, is dangerous.

In my opinion, we don't devote nearly enough scientific research to finding a cure for jerks.

Well, that's your opinion, isn't it? And I'm not about to waste my time trying to change it.

I do this real moron thing, and it's called thinking. And apparently I'm not a very good American because I like to form my own opinions.