Imagine a really beautiful castle, full of treasures, but with no door and no wall. Any villain could walk right in, mess everything up, and steal the treasures.
The Bible says our heart and our little head are just like that castle. When we get angry and start yelling, crying, or hitting things, it's like we're knocking down the castle walls. Then the "little monsters" of sadness and chaos come in and ruin our day!
But when we get upset, close our eyes, take a deep breath, and say "I'm not going to yell," we're building a giant wall of stones! Jesus was like that: even when people were mean to him, he didn't lose his calm. The strongest kid isn't the one who hits, it's the one who knows how to use the superpower of calm!