A Christian is not a person ...

A Christian is not a person who believes in his head the teachings of the Bible. Satan believes in his head the teachings of the Bible! A Christian is a person who has died with Christ, whose stiff neck has been broken, whose brazen forehead has been shattered, whose stony heart has been crushed, whose pride has been slain, and whose life is now mastered by Jesus Christ.
A Christian is not a person who believes in his head the teachings of the Bible. Satan believes in his head the teachings of the Bible! A Christian is a person who has died with Christ, whose stiff neck has been broken, whose brazen forehead has been shattered, whose stony heart has been crushed, whose pride has been slain, and whose life is now mastered by Jesus Christ.
 John Piper

Quotes from the same author

My mother, who grew up in Pennsylvania, literally washed my mouth out with soap once for saying, 'Shut up!' to my sister. She would have washed my mouth out with gasoline if she knew how foul my mouth was racially when she wasn't around.
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 John Piper
Betrayed by Judas, denied by Peter, abandoned by the eleven, forsaken by God. Darkness, you get one hour. Then you die.
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 John Piper
Not to abide in Jesus’ love would mean that we stop believing that we are loved by Jesus. We look at our circumstances - perhaps persecution or disease or abandonment - and we conclude that we are not loved by Jesus anymore. That’s the opposite of abiding in the love of Jesus. So abiding in his love means continuing to believe, moment by moment, that we are loved.
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 John Piper
According to the spirit of this age, the ultimate sin is no longer the failure to honor and thank God but the failure to esteem oneself. Self-abasement, not God-abasement, is the evil. And the cry of deliverance is not "O wretched man that I am, who will deliver me?" but "O worthy man that I am, would that I could only see it better"!
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 John Piper
The formation of the life of a person in the womb is the work of God, and it is not merely a mechanical process but a work on the analogy of weaving or knitting: "Thou didst knit me together in my mother's womb" (psalm 139:13). The life of the unborn is the knitting of God, and what He is knitting is a human being in His own image, unlike any other creature in the universe... The destruction of conceived human life - whether embryonic, fetal, or viable - is an assault on the unique person-forming work of God.
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 John Piper