"We all come into the world in ignorance of ourselves, and of everything around us. By a fundamental law of our natures we are all constantly impelled by the desire of happiness, and the fear of pain. But we have everything to learn, as to what will give us happiness, and save us from pain. No two of us are wholly alike, either physically, mentally, or emotionally; or, consequently, in our physical, mental, or emotional requirements for the acquisition of happiness, and the avoidance of unhappiness. No one of us, therefore, can learn this indispensable lesson of happiness and unhappiness, of virtue and vice, for another. Each must learn it for himself. To learn it, he must be at liberty to try all experiments that commend themselves to his judgment. Some of his experiments succeed, and, because they succeed, are called virtues; others fail, and, because they fail, are called vices. He gathers wisdom as much from his failures as from his successes; from his so-called vices, as from his so-called virtues. Both are necessary to his acquisition of that knowledge --- of his own nature, and of the world around him, and of their adaptations or non-adaptations to each other --- which shall show him how happiness is acquired, and pain avoided. And, unless he can be permitted to try these experiments to his own satisfaction, he is restrained from the acquisition of knowledge, and, consequently, from pursuing the great purpose and duty of his life.
A man is under no obligation to take anybody’s word, or yield to anybody authority, on a matter so vital to himself, and in regard to which no one else has, or can have, any such interest as he. He cannot, if he would, safely rely upon the opinions of other men, because be finds that the opinions of other men do not agree. Certain actions, or courses of action, have been practised by many millions of men, through successive generations, and have been held by them to be, on the whole, conducive to happiness, and therefore virtuous.