Parshas Acharei Mos: Was Aharon a born אוֹהֵב שָׁלוֹם וְרוֹדֵף שָׁלוֹם, or did he become one?

Parshas Acharei Mos: Was Aharon a born אוֹהֵב שָׁלוֹם וְרוֹדֵף שָׁלוֹם, or did he become one? — מובחר ועד הנגינה