He may have benefited from some of the inward contemplation of his personal mind-body spirituality* that some mystics practice. Look at Tuvoc; he used meditation and inward contemplation as an exploration of "self" in a way that helped him control his emotions and, frankly, to try to be the best Vulcan he could be. That type of contemplation of the self through meditation and reflection to become intimately familiar with one's self, including emotions, is something I suspect (going by what we have seen in various Star Treks) is common among Vulcans. *And I use "spirituality" in the non-religious way. A mind-body spirituality that has no affiliation with a supreme deity, but rather is about fine tuning the the conscious and subconscious self.