What was the reason for the martyr's leadership's emphasis on "Holy Unity" after the 12-day war?

Ayatollah Ahmad Meghari, a member of the Assembly of Leadership Experts, stated: Holy unity, national unity, and nation-building were among the previous thoughts of the martyred leader, and with the occurrence of the 12-day war and the change in the region, the martyred leader entered a new stage of nation-building and proposed the holy unity.