I think the key to living an abundant Christian life is this: Abide in Christ.
I have written several blog posts about the abiding life, and injected it into my books on praying and discipleship.
Now my friend Bob Myers has written a beautiful book on the abiding life: A Life that Matters: Learning to Abide in Christ.
This is a tremendous supplement to my teachings on abiding in Christ. Thoughtful, prayerful, helpful, encouraging, devotional, and more.
I highly recommend it!