We do well to ponder this question.
It is something very different from the life of the average Christian. Indeed a consideration of the written Word of God -- of the Sermon on the Mount for example -- should lead us to ask whether such a life has ever in act been lived upon the earth, save only by the Son of God Himself. But in that last saving clause lies immediately the answer to our question.
The Apostle Paul gives us his own definition of the Christian life in Galations 2:19-20.
It is "NO LONGER I, BUT CHRIST".
Here he is not stating something special or peculiar -- a high level of Christianity. He is, we believe, presenting God's normal for a Christian, which can be SUMMARIZED in the words:
I LIVE NO LONGER, BUT CHRIST LIVES HIS LIFE IN ME.
God makes it quite clear in His Word that He has only one answer to every human need -- His Son, Jesus Christ. In all His dealings with us He works by taking us out of the way and substituting Christ in our place. The Son of God died instead of us for our forgiveness: He lives instead of us for our deliverance.
So we can speak of two substitutions -- a Substitute on the Cross who secures our forgiveness and a Substitute within who secures our victory.
It will help us greatly, and save us from much confusion, if we keep constantly before us this fact, that God will answer all our questions in one way only, namely, by showing us more of His Son.
(Watchman. Nee. The Normal Christian life)