Why does God call His people to establish memorials: things that help us remember the great things He has done in our lives? Why is it important for us to have testimonies? Why does God perform miracles? Why did God deliver us? Why? Ultimately, so that His name is glorified. So that people will be drawn to Him. Memorials proclaim the greatness, faithfulness, and the almighty power of God. It reminds the world that He is King, He is good, He is just, He is Lord, and He is our HERO!
He did this (stopped the waters of the Jordan and had the Israelites build a memorial) so that all the peoples of the earth might know that the hand of the LORD is powerful and so that you might always fear the LORD your God." – Joshua 4:24