The idea of writing this book came to me many years ago, being intrigued by how the "passage" of time affects us all. I wanted to understand what "time" is, to unravel its "secrets" and its insidious way in which it always emerges victorious in the fight against humanity. But are we really in a battle with time? Is it our enemy? Can't we make it our friend during our earthly life? Regardless of whether we consider it a friend or an enemy, time leaves visible the effects of its passage through our individual lives or our collective lives as a society. In this book, I was exclusively concerned with time in a philosophical sense, specifically with how humans perceive it and how they relate time to their philosophical conceptions and religious beliefs. I explored the relationship between temporality and eternity, and I have concluded that, although time and eternity are opposites from all points of view (in the general view), in my view—which I have presented in this book—they are not as opposites. Still, they interpenetrate and influence each other. I have concluded that not only does the past influence our future, but the future can also influence the past. This book is a continuation of my previous works, which explore philosophical and religious themes and complement my philosophical and theological vision regarding the reality around us and what lies beyond it. I have analyzed the concept of time from a philosophical and theological perspective. I examined the concepts of "time" and "eternity" from the perspective of the Abrahamic religions (Christianity, Islam, Judaism) but also from the standpoint of Eastern religions/philosophies from the Far East (Buddhism, Daoism, Hinduism, Shintoism, Confucianism, Jainism). It was essential for me to examine how humans relate to "time" and "eternity," as well as the impact of these philosophical concepts on the lives of common people throughout the millennia. A significant chapter was the realization of a comparative analysis between Eastern and Western thought regarding temporality and eternity. At the end of the book, I conclude that the emergence of a new temporal system is inevitable in the future, given humanity's evolution and the increasing influence of AI on human society. Understanding the concepts of "time" and "eternity" helps us integrate better into society and have a broader, more inclusive vision of humanity. I hope that the readers from the West will gain a deeper understanding of Eastern philosophy and that those from the Far East will have a clearer vision of how Westerners live their daily lives. This book aims to decipher the "energies and philosophies" that shape a community's behavior, whether it behaves similarly or differently from other communities. Religions and philosophies are essential for the health of communities, and the concepts of "time" and "eternity" are crucial to them Therefore, their understanding is essential for the general progress of humanity.