This is his passion, to the exclusion of all other values and activities. This "ruling passion" would be described by Allport as a

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Allport's theory includes the concept of cardinal traits, which are the dominating traits that shape a person's behavior to the point where almost every action can be traced back to that trait. This "ruling passion" described in the question fits the definition of a cardinal trait as it is the most dominant and all-encompassing trait in the individual's personality.

This Is His Passion, to the Exclusion of All Other