Ubaldi was graduated in Law and Music, at Rome. A student of various philosophical and religious traditions, he distinguished himself as a Christian thinker. He had two children, Agnese and Franco, who died during the second world war. A descendant of an afluent family of Umbria, Ubaldi renounced richness to be faithful to the gospel. First he went to Sicily to teach English in a secondary school, then, always as a teacher, he went to Gubbio, where he lived for twenty years.
Ubaldi authored 24 books: 12 in Italy and 12 in Brazil. The Great Synthesis is considered one of his principal works.
List of books
Since most of Pietro Ubaldi's books are not available in English, titles are only a translation of their Italian versions and might vary once formally published.
1 – Great Messages
2 – The Great Synthesis (Synthesis and Solution to the Problems of Science and Spirit)
3 – Mental Currents (The Nours)
4 – Mystical Ascent
5 – Story of a Man
6 – Fragments of Thought and Passion
7 – The New Civilization of the Third Millennium
8 – Problems of the Future
9 – Human Ascents
10 – God and the Universe
11 – Prophecies (The Future of the World)
12 – Commentaries
13 – Current Problems
14 – The System (Genesis and Structure of the Universe)
15 – The Great Battle
16 – Evolution and the Gospel
17 – The Law of God
18 – The Functional Technique of the Law of God
19 – Fall and Salvation
20 – Principles of a New Ethics
21 – The Descent of Ideals
22 – A Destiny Following Christ
23 – How to Orient One's Life
24 – Christ
