From the same university, he obtained his doctorate in Philosophy.

At this school, he obtained, on 2 July 1880, the bachelor's degree in philosophy.

David left the priesthood and obtained a doctorate in Philosophy.

In 1977 he obtained a degree in literature and philosophy.

Then he obtained a master's degree in philosophy of law from a British university in 1979.

He then obtained a master's degree in philosophy from the University of Toronto.

In 1920, he obtained a university degree in philosophy.

He obtained his doctorate in philosophy from the University of Oxford.

He obtained a doctorate in political philosophy from the University of Ottawa.

From the Gregorian he obtained doctorates in philosophy and theology.