Quote from John Ortberg's The Life You've Always Wanted:

"I suspect that if someone had asked the apostle Paul or the apostle John about his spiritual life, his first question would have been, 'Am I growing in love for God and people?' The real issue is what kind of people we are becoming. Practices such as reading Scripture and praying are important-not because they prove how spiritual we are-but because God can use them to lead us into life."