This quote by Condoleezza Rice suggests that in order for a group of individuals to come together and join, they require to have a typical opponent. This might be analyzed in a range of ways. On a global scale, it could indicate that in order for nations to come together and work towards a typical goal, they need to have a shared enemy. This might be a nation, a group, or an ideology. On a smaller scale, it might indicate that in order for a group of people to come together and form a strong bond, they require to have a shared enemy. This could be an individual, a group, or an idea. In either case, the idea is that having a typical enemy can help to bring individuals together and create a sense of unity.
"When the principles that run against your deepest convictions begin to win the day, then the battle is your calling, and peace has become sin. You must at the price of dearest peace lay your convictions bare before friend and enemy with all the fire of your faith"