Choose two of the quotes and compare them. What ideas are similar and different?

Below you will find four quotes about peace. Choose two of the quotes and compare them. What ideas are similar and different?
“Peace is a daily, a weekly, a monthly process, gradually changing opinions, slowly eroding old barriers, quietly building new structures.”John F. Kennedy

“It is understanding that gives us an ability to have peace. When we understand the other fellow’s viewpoint, and he understands ours, then we can sit down and work out our differences.”Harry S Truman

“Peace is not absence of conflict, it is the ability to handle conflict by peaceful means.”Ronald Reagan

“It isn’t enough to talk about peace. One must believe in it. And it isn’t enough to believe in it. One must work at it.”Eleanor Roosevelt

Minimum Length: 12 sentence