History teaches that wars begin when governments believe the price of aggression is cheap. To keep the peace, we and our allies must be strong enough to convince any potential aggressor that war could bring no benefit, only disaster.http://www.reagan.utexas.edu/archives/speeches/1984/11684a.htm

Summary

This quote by Ronald Reagan emphasizes the importance of maintaining a strong military presence to prevent war. It suggests that history has shown that conflicts start when governments perceive aggression to be advantageous and of low cost. To ensure peace, Reagan argues that both the United States and its allies must possess enough strength to dissuade potential aggressors from considering war as a viable option. By making it clear that engaging in war will result in disastrous consequences rather than benefits, the goal is to deter any potential act of aggression.