Reconstruction: On Liberty (Chapter II)
In On Liberty, John Stuart Mill argues that an individual must be granted the liberty of thought and discussion even if their opinion is true. He claims that those who deny the freedom of thought and discussion assume opinions are capable of infallibility. This is wrong because no opinion is absolute and universal. As such, no opinion should be considered infallible because that denies the public a capacity to exchange errors for truths. Hence, the development of truth is a consequence of open discussion between people who hold different beliefs.
Mill claims that by denying the freedom of thought and discussion, one assumes opinions are capable of infallibility. The silencing of an opinion assumes another opinion is unmistakeably absolute and universal (19). However, assuming infallibility is wrong because nobody is infallible. The only way in which a human gains truth is by being receptive to changing their beliefs and by engaging with the beliefs of others, not by experience alone (22). Truth is facilitated by the removal of mistaken beliefs from our beliefs, as such, one cannot state his opinions are true and universal without any external input (20). Individuals are limited to a set of opinions; therefore, they cannot argue the opinion they are silencing to be an absolute falsehood or the opinion they are promoting to be an absolute truth. For instance, Socrates was silenced because his fate was decided by a small, private and homogenous jury (26). A person who suppresses an opinion mistakes their certainty for the absolute certainty of mankind. Thus, assuming infallibility is wrong because no opinion is absolute and universal.
Nobody is infallible because humans acquire truth by removing errors from our beliefs. Mill argues that an opinion is validated by engaging in clash of opposing beliefs. For an opinion to reach the assurance sufficient for the purposes of human life, it must first invite the whole world to polish away errors and reveal its truths (21). Newtonian physics is only true because all of mankind is capable of questioning, discussing and disputing it (23). The errors of an opinion will yield to fact and argument, but the truths will not. The core ideas of the Protestant Reformation existed prior to Martin Luther and were put down, but the truths continued to be rediscovered. Eventually, due to the favourable circumstances of the period, Luther was successful in spreading those ideas without prosecution (29). Many of the opinions we consider absurd today were previously regarded as true (21). The virtuous Socrates of today died as a blasphemer because his opinions were deemed dangerous (26). A constant trial of diverse opinions is necessary to refine our beliefs and yield judgements deserving of confidence. In turn, the removal errors and discovery of truth depends on the existence of conversations that oppose our beliefs with a diverse group of people.
Freedom of discussion is necessary for people to obtain knowledge. According to Mill, humans are fallible because they gain knowledge only through the purification of opinions. To acquire the purest truth, humans must remove errors from their beliefs by engaging in a diverse series of trials; the larger the variety of opinion, the purer the truth will become. The capacity to disprove an opinion allows us to assume it is true and subsequently engage with it as a truth (21).
Thus, one should not limit an individual’s liberty of thought and discussion even when it does so in accordance with public opinion. The public must have the right to assert unrestrained opinions, as the silencing of a potentially true opinions robs those who dissent from correcting their own beliefs (19). Therefore, for truth to exist the freedom of thought and discussion must exist even if the opinion is true.
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