Never adopt the teachings of any book or person without first examining whether they are just or not, as you will otherwise be liable to be hurried away by prejudices instead of being guided by reason, and will be led unconsciously into error instead of arriving at the truth. Exercise your reason; reflect, examine, and analyze, in order to form a sound judgment. Do not shrink from the trouble of thinking. The majority of mankind can hardly be said to think; their notions are almost all adopted. Local prejudices do not impose upon cultivated and reflecting minds. Guard against prejudices by a manly exertion of your reasoning faculty. The worst form of slavery is the subjection of the mind. The man who dares not to think is the most object slave in nature.