Preface

 

“Thinking leads man to knowledge. He may see and hear, and read and learn whatever he pleases, and as much as he pleases; he will never know anything of it, except that which he has thought over, that which by thinking he has made the property of his own mind.”

 
 --Pestalozzi

There is nothing we do as humans that does not involve thinking. Our thinking tells us what to believe, what to reject, what is important, what is unimportant, what is true, what is false, who are our friends, who are our enemies, how we should spend our time, what jobs we should pursue, where we should live, who we should marry, how we should parent. Everything we know, believe, want, fear, and hope for, our thinking tells us.

It follows, then, that the quality of ...

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