This book serves as an outstanding introduction to the theory of numbers, a fascinating field that attracts the lover of wisdom into its magnanimous arbitrary fields of gold. In that higher realm, numbers become the pillars upon which we build everything we know. Once you see them, you cannot un-see; once you taste the sweetness of their harmony, honey becomes dull. Yours eyes find their glimpse in the faintest of shadows, and through them, higher sciences are obtained.
The book is designed to cover the fundamentals, and I claim that it is not very friendly to those who are not previously acquainted with the skill of extracting theorems and definitions from mathematical texts. This is how it differs from a conventional textbook: it does not tell you that it is providing you with a valuable definition or theorem at the moment of doing so; it rather allows you to extract it by providing an insightful motivation in the process. Arguably, by doing that, the reader will grasp the more comprehensive perception, and the knowledge obtained in this process is thus trapped in one's memory.
I loved it so much.