Prejudice is an opinion without judgment. Thus, throughout the world, children are inspired with opinions before they can judge. There are universal and necessary prejudices, and these even constitute virtue. In all countries, children are taught to acknowledge a rewarding and punishing God; to respect and love their fathers and mothers; to regard theft as a crime, and interested lying as a vice, before they can tell what is a virtue or a vice. Prejudice may, therefore, be very useful, and such as judgment will ratify when we reason.

Sentiment is not simply prejudice, it is something much stronger. A mother loves not her son because she is told that she must love him; she fortunately cherishes him in spite of herself. It is not through prejudice that you run to the aid of an unknown child nearly falling down a precipice, or being devoured by a beast.

But it is through prejudice that you will respect a man dressed in certain clothes, walking gravely, and talking at the same time. Your parents have told you that you must bend to this man; you respect him before you know whether he merits your respect; you grow in age and knowledge; you perceive that this man is a quack, made up of pride, interest, and artifice; you despise that which you revered, and prejudice yields to judgment. Through prejudice, you have believed the fables with which your infancy was lulled: you are told that the Titans made war against the gods, that Venus was amorous of Adonis; at twelve years of age you take these fables for truth; at twenty, you regard them as ingenious allegories.

Let us examine, in a few words, the different kinds of prejudices, in order to arrange our ideas. We shall perhaps be like those who, in the time of the scheme of Law, perceived that they had calculated upon imaginary riches.
Prejudices of the Senses.

Is it not an amusing thing, that our eyes always deceive us, even when we see very well, and that on the contrary our ears do not? When your properly-formed ear hears: “You are beautiful; I love you,” it is very certain that the words are not: “I hate you; you are ugly;” but you see a smooth mirror — it is demonstrated that you are deceived; it is a very rough surface. You see the sun about two feet in diameter; it is demonstrated that it is a million times larger than the earth.

It seems that God has put truth into your ears, and error into your eyes; but study optics, and you will perceive that God has not deceived you, and that it was impossible for objects to appear to you otherwise than you see them in the present state of things.
Physical Prejudices.

The sun rises, the moon also, the earth is immovable; these are natural physical prejudices. But that crabs are good for the blood, because when boiled ............