Mind concentration is very important to do any work in the best way. When we read books, we concentrate our mnd in books. There are many books which are our friends and gives us knowledge. Hence person becomes smart and intelligent.
You will never be lonely, if you have a book with you.
Very true, when you have a hobby like reading you can never feel lonely, in fact you will want to have time for yourself so that you can read in peace, at least thats what I long for when there are too many people around for a long period of time..