Apart from his judicial work, Justice Cruz was a dedicated educator, teaching Political Law, Constitutional Law, and Public International Law at prestigious institutions such as the Ateneo de Manila University, the University of Santo Tomas, and San Beda College. He also wrote a widely read column, "Separate Opinion," for the Philippine Daily Inquirer . This blend of scholarly expertise and real-world judicial experience made his textbooks uniquely authoritative. His book on public international law was not merely a theoretical exercise; it was a distillation of principles shaped by a practitioner and a teacher. Given his stature, it is no surprise that law students hold his works in such high regard.
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