The author of the intellectual bestseller “How to Read Books,” Mortimer Adler, in his new book “Six Great Ideas,” once again proves that philosophy is important for every person. What do we mean when we say “this is true” or “this is a lie”? How does our understanding of truth affect our perception of beauty and goodness? How does the awareness of what is good and what is bad shape the idea of justice? Great ideas are important for understanding ourselves, society and the world in which we live. This book is for anyone who would like to learn about such eternal ideas as justice, equality and truth from the lips of a professional philosopher and teacher.