Considered from the perspective of the spirit that animated it, the various aspects of Paul’s work formed a perfect unity inasmuch as his mission consisted of service of the Living God to the exclusion of all else. Prior to the Damascus event, this mission was characterized by zealous service of the Law of Moses (a zeal worthy of imitation); afterward, it was characterized by fervor for Christ and his Gospel, because under the noonday sky of Damascus Paul was “seized” by God and set apart to carry out a unique mission.
The generous and singleminded dedication to God which he displayed prior to Damascus did not change in nature or object, but simply in direction.
However, if we consider the way in which Paul manifested his dedication, then his work was very complex, reflecting the life of a person constantly on the move. He maintained this style of life for about 20 years (from circa 45 A.D. up to his death), always on the go as a result of his insatiable need to evangelize as many people as possible.