Imagine a giant, super strong train running on the tracks (Chooo-choooo!). Now imagine a very clever little ant making a plan, putting a twig on the tracks and saying, "I'm going to stop this train!" Is the train going to stop? Of course not! The train rolls right over the twig like it's nothing.
The Bible says God is like that giant, unstoppable power. Sometimes mean people, or even our own stubborn thoughts, try to go against God. But it's no use! Nobody is stronger, smarter, or bigger than our Father in Heaven. That's why we're always safe: because our Father owns everything and nobody can ever defeat Him!