"A mistake can be a great teacher, provided the child is allowed to experience the consequences of the mistake. However, it is the empathy expressed by the adult that drives the pain of the consequences into his or her heart and turns experience into long-term memory and wisdom."
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Teaching with Love and Logic, pg 39
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While this is referring to behavior, I talk to my students about how making mistakes academically is ok — as long as they learn from it. I tell them that the lessons they learn from mistakes stick a lot harder. I think the same goes for behavior situation, and I think as a teacher the part about empathy is essential.