We are all of us more or less the slaves of opinion. - William Hazlitt

The slaves of power mind the cause they have to serve, because their own interest is concerned; but the friends of liberty always sacrifice their cause, which is only the cause of humanity, to their own spleen, vanity, and self-opinion.

We are very much what others think of us. The reception our observations meet with gives us courage to proceed, or damps our efforts.

THE rule for travelling abroad is to take our common sense with us, and leave our prejudices behind us. The object of travelling is to see and learn; but such is our impatience of ignorance, or the jealousy of our self-love, that we generally set up a certain preconception beforehand (in self-defence, or as a barrier against the lessons of experience,) and are surprised at or quarrel with all that does not conform to it. Let us think what we please of what we really find, but prejudge
nothing. [Notes of a Journey Through France and Italy]