What was the heart of the Reformation?

Curt Daniels explains in this video that he believes that the heart of the Reformation was the sola, Soli Deo Gloria – "to the glory of God alone." The Calvinists also considered this to be the most important out of the Five Solas. In the Westminster Shorter Catechism, the answer to the first question states that, “man’s chief end is to glorify God, and to enjoy him for ever.”

God alone saves unbelievers. Accordingly, man was created to glorify God. God alone receives all of the glory. There is nothing we can point to show how we somehow merit salvation. Isaiah 42:8 says: “I am the Lord, that is My name; and My glory I will not give to another, nor My praise to carved images.” 

1 Corinthians 10:31 (NKJV) – “Therefore, whether you eat or drink, or whatever you do, do all to the glory of God.” 

The heart is usually considered the five sola doctrines. Sola scriptura, scripture alone. And the other ones mainly deal with salvation. So, Legrat here was saved by grace alone. And then Sola Fide, by faith alone, and those two are combined in occasions too.

And then by Christ alone, not by priests, popes, parents, ourselves, or anybody else. And then what Calvinists considered the most important one was Soledad o Gloria. Everything is for the glory of God. That's the heart of the Reformation. You