Revelation 15:1-4 “I saw in heaven another great and marvelous sign: seven angels with the seven last plagues – last, bc with them God’s wrath is completed. And I saw what looked like a sea of glass glowing with fire and, standing beside the sea, those who had been victorious over the beast and its image and over the number of its name. They held harps given them by God and sang the song of God’s servant Moses and of the Lamb:

Great and marvelous are Your deeds, Lord God Almighty. Just and true are Your ways, King of the nations. Who will not fear You, Lord, and bring glory to Your Name? For You alone are holy. All nations will come and worship before You, for Your righteous acts have been revealed.
There are a couple things I find fascinating about the song the Lamb. 
#1 – Did you notice it also happens to be the song of God’s servant Moses? Moses and Jesus are not opposed to each other. God’s commands and God’s grace are not in opposition. Indeed it is the grace of God that He is willing to show us how to live by giving us commands to live by. (Way more could be said about this topic but will drop it for now)
#2 – It’s not about me and my salvation. The song that we will be singing in the age to come probably won’t be a song that focuses on what God did for me on the cross. In fact, according to Rev 15 it will be a song that focuses fully and completely on who God is and what He did to make His Name great.
Is it wrong to praise God for your salvation – absolutely not! Truthfully, if you’re not sure what else to thank Him for that is a great place to start. What God did in saving us God alone knows. It is an amazing act, one that we could spend an eternity on and never come to the end of. 
So, yes praise God for your salvation  but don’t stop there. Let that praise build and let it encourage you to not simply praise God for what He’s done for you, but to worship the Lord for who He is.
We have a quote that gets put up weekly at my church. “Prayer is preoccupation with our needs, praise is preoccupation with our blessing, but worship is preoccupation with God Himself.” Leonard Ravenhill.
Believer, through the power of the Holy Spirit may we begin with prayer and what we need, may we move into praise as we thank God for the work that He has accomplished, but may we end with true worship as we focus fully and completely on who God is regardless of what He has done for me.