In spite of all his activities, Wojtyladidn't slight his scholarly duties.He wrote a treatise in 1960 called ‘‘Loveand Responsibility’‘ that laid out the foundation for what Weigel calls ‘‘amodern Catholic sexual ethic.’‘
His second doctoral thesis -- ‘‘Evaluation of the possibility of Constructing a Christian Ethic based on the System of MaxScheler’‘ -- was published that same year.
 In 1969, the Polish Theological Societypublished Wojtyla's ‘‘The Acting Person,’‘ a dense philosophical tract onphenomenology that Wojtyla discussed during a U.S. visit in 1978.
‘‘All sorts of people turned up,’‘ recallsJude Dougherty, chairman of the philosophy department at Catholic University inWashington, D.C. where the talk was held. ‘‘It was extremely well-received
bypeople who were familiar with the subject. And those who weren't were awed tohear a cardinal who was very learned and very scholarly.’‘
Weigel wrote that in 1976, when Wojtylawas invited to lead spiritual exercises before Pope Paul VI at a Lentenretreat, his first three references were to the Bible, St. Augustine and Germanphilosopher Martin Heidegger.
In 1977, Wojtyla gave a talk at auniversity in Milan called ‘‘The Problem of Creating Culture through HumanPraxis.’‘
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