Constructive Conflict
Constant conflict plays a critical role in our progression. Without conflict, we grow lazy. Resistance is the only thing that makes us stronger. Most people's downfall comes from their inability to maintain a state of conflict, either choosing comfort in exchange for entropy or embarking in conflicts they cannot emerge victorious from without significant loss. Mao Tse-tung used Japan's invasion of China to rally his troops for a cause of good vs. evil. This conflict gave them the experience needed to later defeat the Nationalist party. When the conflict passed, he knew his people were trending towards weakness, so he encouraged disagreements with the U.S. and the Soviet Union. Always having a declared enemy. A known and chosen conflict provides the fuel needed to prove you're worthy. Robert Greene says, "A person who has something to prove will move mountains."