This short verse contains what is called the "most perfect interpretation in a few words of what it means to be a Christian.
Philippians 1:21 "For to me to live is Christ, and to die is gain."
“For me to live is Christ,” [Paul] declared. This is the most perfect interpretation in a few words in all the Scriptures, of what it means to be a Christian. This is the whole truth of the gospel. Paul understood that which many seem unable to comprehend. How intensely in earnest he was. His words show that his mind was centered on Christ, that his whole life was bound up with his Christ. Christ was the author, the source, and the support of his life." {Ms41-1897.13}