Christians worship on a Sunday because it is resurrection day. It is an opportunity to look back and celebrate what God has done through Jesus.
Today’s verse is a celebration of what God has done in the past – that gives strength in the battle today. Today’s verse says: “The Lord is my strength and my song; He has become my salvation.”
Exodus 15:2 says, “The Lord is my strength and my song, and He has become my salvation.”
Exodus 15 is a song of celebration after God had brought His people through the Red Sea. In Psalm 118:14, in the middle of great trouble, the Psalmist is remembering God’s salvation of His people through the Red Sea.
He got his strength to pray and fight through remembering God’s salvation.
We get our strength today to pray and to face the battles through remembering God’s salvation for us, remembering what He has done – He has rescued us from sin and death. Sunday – sometimes called “the Lord’s Day” – is the day He rose and defeated death.
We can look back today and say, “He has saved me. He is the same Jesus today. He is with me today. I am safe today.”
We can be sure that He will meet our needs because He has already done the greatest thing: “He who did not spare His own Son but gave Him up for us all, how will He not also with Him graciously give us all things?” (Romans 8:32)