In ""Know Thy Adversary but first and foremost Know Thyself"", a seasoned cybersecurity executive explores how the timeless strategies of Sun Tzu's The Art of War offer profound and practical guidance for today's digital battlefields. Drawing a straight line from ancient warfare to modern cybersecurity, this book reimagines Sun Tzu's core teachings through the lens of a practicing Chief Information Security Officer (CISO) navigating today's high-stakes, high-velocity threat landscape. At the heart of this exploration is Sun Tzu's enduring wisdom: ""Know yourself and know your enemy."" The book unpacks how this principle is not just a strategic ideal but a critical operational mandate for CISOs who must continuously assess their organization's cyber readiness while anticipating the evolving motives and capabilities of adversaries-be they cybercriminals, nation-state actors, or insider threats.