Iain Murray writes:
Christianity means knowing and trusting Christ as a living Person; it is a relationship which so captures both the mind and the heart of the believer that henceforth to know Christ, to esteem Him and His words, becomes the very object of existence: “To you who believe He is precious” (1 Pet. 2:7) – more precious certainly than all earthly goods or even life (Luke 14:26). A Christian is someone who no longer lives for himself but understands, with Paul, why Christ is his righteousness, his life, his all . . . A Christian . . . is one who so knows Christ that all things are secondary to his Saviour . . . A Christian is one whose greatest pleasure is to see God magnified in Christ.
Iain Murray, Evangelicalism Divided (Carlisle: Banner Of Truth, 2001), 152, 159, 166, 316.
(HT: Dan Orr)
Already Not Yet 
“A Christian is someone who no longer lives for himself …all things are secondary to his Saviour”
Amen!