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Through freedom of thought. Though it might be reduced to you and you only, if you have not taken precautions to connect and bind yourself to a man or a woman, to your parents and your children and like minded close friends. By the time the freedom of speech is not practiced to one another, you cannot be certain any more, since no one will speak their mind. To be sure of a persons mind, you must know him or her, beforehand (for quite a time). If you don't, you will be unsure.