Let all those that seek Thee rejoice and be glad in Thee: let such as love Thy salvation say continually, “The LORD be magnified.” – Psalm 40:16
The world is dull and sleepy, and utterly indifferent to the glory of God in the work of redemption. We need to tell it over and over and over again, that God is great in the salvation of His people. There are many, who will rise up and deny God’s Glory; revilers of all sorts abound in rage; but over and above their clamor, let the voice of truth be heard, “Let God be magnified.” They cry, “the Bible is worn out.” They doubt its inspiration, they question the deity of Christ, they set up new gods that have lately come up, that our fathers knew not. Let us confront them with the truth, let us oppose them with the gospel, let us overcome them through the blood of the Lamb, using this one only war-cry, “Let God be magnified.” Everywhere in answer to all blasphemy, in direct conflict with profanity, let us lift up this voice with heart and soul. “Let God be magnified.”
It is only right, and according to the fitness of things, that God should be magnified in the world which He Himself created. Such a handiwork deserves admiration from all who behold it. But when He new-made the world, and especially when He laid the foundation of His new palace in the fair colors of Jesus’ blood and adorned it with the sapphires of grace and truth; He had a double claim upon our praise. He gave His Son to redeem us, and for this let His praise be great and endless. Things are out of joint if God the Redeemer be not glorified. Surely the wheels of nature revolve amiss, if God, the loving and gracious, be not greatly magnified. As every right-hearted man desires to see right and justice done, therefore does he wish that those who love God’s salvation may say continually, “Let God be magnified.”… He who blesses God blesses himself. We cannot serve God with the heart without serving ourselves most practically. Nothing, brethren, is more for your benefit than to spend and be spent for the promotion of the divine honor. ~ C.H. Spurgeon
https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1013.cfm