The book examines the enduring principles of the First Amendment in the face of evolving societal challenges. Lee C. Bollinger, a distinguished legal scholar and former President of Columbia University, draws upon his extensive expertise to explore the fundamental tenets of free speech and its critical role in a democratic society. The work analyzes how established legal doctrines must adapt to new technological landscapes and shifting cultural norms, arguing for a vigilant and principled defense of open discourse. Bollinger's analysis considers historical precedents and contemporary debates to construct a framework for understanding the First Amendment's ongoing relevance.

Eternally Vigilant is recognized as a significant contribution to First Amendment scholarship, offering a robust defense of free speech principles. Scholars and legal professionals have noted Bollinger's clear articulation of complex legal concepts and his prescient analysis of emerging challenges. The book is frequently cited for its thoughtful engagement with the tension between protecting expression and addressing societal harms. It is regarded as an essential text for understanding the enduring importance of the First Amendment in contemporary American law and society.