The importance of the book, Identity Conscience: Nationalism & Internationalism, lies in the significance of the message, Harmonization of Nationalism and Internationalism for the sake of Universalism, Humanism, Global Citizenship and Global Identity of International Community respecting the multiplicity of individuals' identity which is actually the integral part of the core theme of the book that attempts to propagate the considerations of global citizenship of international community with multidimensional aspects of universalism and the values of humanism. First section of the book discusses the identity of human beings, approaches to study the identity and the topics pertaining to the dimensions of identity, and seeks to study the Identity as a subject with universal, individual and pro-belonging approaches which the Author has categorized based on his understanding over the identity science and the approaches to study the same. Secondly, prior to studying the role of nationalism and patriotism in the development of some of the countries of Asia, Europe and Americas and after highlighting some aspects and attributes of nationalism in India and regional as well as national feelings among the Indians, the Author has put in the concept of nationalism with certain other views on the same and post that he highlights the issues and impacts of forceful elements of regionalism, ethnocentrism and identity related concerns in several geographies of the Globe: Russia, Japan, China, the USA, Israel and some of the European and Latin American countries. Well, developed countries would have, to a great extent, developed a unified society with certain universal codes of conduct for their Nation-States by developing one national identity, but most of the Asian and African countries are still considerably away from building a strong national identity for their respective Nation-States. Monroe Doctrine, Truman Doctrine and Trump's America First Policy which have left a significant impact on America's domestic and foreign policy as well as her considerations of Nationalism and Internationalism are some of the aspects that have been observed critically in this book. Third section of the book depicts five kinds of reactions/responses to different situations/occurrences, and outlines as to what kinds of responses/reactions are ideal & constructive and what are destructive in a Family, Society, Organization, or Nation; and how it impacts the Identity. Fourthly, the Author outlines the imperatives and considerations of internationalism, universalism and humanism in the era of globalization and interdependency through which the protection of Global Citizens can not only be ensured but also be propagated and nourished as a global culture and universal civilization of international community. Other topics discussed in this book are the apparent crisis of institutional trust over the Governments, States & her mechanisms, global politico-ethical crisis, Ethical Core Values for Nation-States, The Relevancy of Ethics in Social, Financial and Political Business, and the imperatives and considerations of Nation-States for International Community. Subsequently, the book raises certain perceptive aspects which advocate that the United Nations should be bestowed with even more authority as an Organization, and that the Organization is required to be considered as a Global Nation with international community as global citizens. And, last but not the least, the book has advanced to touch upon the topic of global sustainability of the development and universal sensitivity for the environment and climate change which is one of the mediums to connect the people of different identities of the globe and to bring them at one platform to establish their collective duties towards nature. The book concludes with a really didactic poem of the Author titled "My Poem on Universalism & Humanism" that actually attempts to sum up the book in a real sense.