While I stood watching the amazing power of the Niagara Falls, I noticed that other tourists suddenly began taking photos. Looking in the same direction where they were focused, I saw a rainbow had appeared—arching across the river. It seemed to begin at the base of the Horseshoe Falls, ending at the base of the American Falls.

In reality, there’s no end to a rainbow. A rainbow is a full circle, something I’ve seen only once. I was gazing out an airplane window when the sun—shining in just the right direction—revealed a full-circle rainbow in the distance above the clouds. I sat enthralled with the sight until the plane turned and the circle disappeared.

That rainbow gave me much to consider—how God has no beginning or end, and that He reveals His promises to us no matter where we are. Our never-ending, eternal God “set [His] rainbow in the clouds” as a promise to never flood the earth again “to destroy all life.” Even today, our Creator shares His reminder of that promise with us, His creation (Genesis 9:13-16).

Isaiah 40:28 says, “The Lord is the everlasting God, the Creator of all the earth. . . . No one can measure the depths of his understanding” (nlt). What an amazing thought! We will have eternity to learn about our promise keeper, and we will never reach the ultimate depth of His understanding.