It is written. ?Behold, how good and how pleasant it is for brethren to dwell together in unity?. (Psalm 133) Where there is unity there is peace and development. But unity cannot be achieved unless people know themselves by nature. For this reason, this book has been written to make people aware, of the different kinds of human nature in order to make right choices for marriage, friendship and leadership, as well as career, profession and occupation. This book will also enable people to know the peace, medicine in order for peace which serves as the sources of unity and development in life, society and a nation as a whole, to prevail. The Bible says, that, ?My people are destroyed for lack of knowledge?. This book is full of divine truth. Read it to be wiser.