Children learn this central principle early on and soon become expert at using it effectively to suit their own purposes. The phrase ‘‘well, it's just my opinion" can act as a get-out clause which avoids further questioning or the need to give an explanation. A student may well prefer to put up a brick wall and so avoid the difficult task of providing a justification（正当的理由） for their view.They know the holy position freedom of speech holds for all of us and they know the taboo（禁忌）around challenging the opinions of others when they do not produce unfavorable effects on anyone else.

　　This can make things hard for the teacher. We want to promote tolerance and respect in our classrooms and give young people a sense: this is how one ought to behave. Yet, we are also seeking to develop reasoning and critical thinking. To some extent, there is an idea that people's views carry equal weight because all individuals ought to be treated equally. Treating people　equally is different from treating what they say with equal weight, though. We need to make clear to students that the right to one's opinions does not ignore the need to support them with argument when called to do so.

　　Justification is the signal difference between opinion and argument. Opinions are stated;　arguments are advanced. Opinions are given; arguments are proposed. When we ask a student to explain themselves, we are asking them to give us something that will lend evidence to what they have said. We are asking them to convince us, to persuade us, to show us the reasonableness of what it is they are saying.

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