'Demonstrate' in the Bible

It was to demonstrate His righteousness at the present time, so that He would be just and the One who justifies those who have faith in Jesus [and rely confidently on Him as Savior].

[and He did this] so that in the ages to come He might [clearly] show the immeasurable and unsurpassed riches of His grace in [His] kindness toward us in Christ Jesus [by providing for our redemption].