How did the concepts of balance of power and reason of state influence international relations in the eighteenth century?

In the eighteenth century, the balance of power concept shaped diplomacy by advocating for the distribution of power to prevent any one state from dominating the others. Reason of state, on the other hand, allowed rulers to prioritize the security and stability of their own states over moral or ethical considerations when making foreign policy decisions. These concepts contributed to the complexity and pragmatism of international relations during this time period.