It seems to me that as I pursue a single virtue, the closer I get to its “essence” the more that I find myself needing and developing all the virtues.
I started wanting to ensure I never lose my temper.
Then I realized that to keep going I needed to not complain.
Then I realized I couldn’t complain, not even in suffering.
Then I realized that not complaining required me to (a) not criticize people (b) not express discomforts I wasn’t fixing.
But to not criticize people, required that I guard their reputations, even the people I didn’t like.
That required me to give them the best interpretation to their deeds possible. It required me to care.
And that required me to love them.