Lukewarmness

How do you combat "lukewarmness?" In yourself - in others? During the summer, where trials seem fewer and my sense of self-satisfaction and fulfillment at its high, I find myself struggling with this. Last night at small group, apathy and disinterest in spiritual matters abounded. It left me with the question, can I help foster passionate love of Christ in my girls? Is there anything I can do, apart from pursuing it on my own, or is this something entirely up to God? Is this a reminder of the need for prayer?

Where does a longing, passionate, driven, all-consuming love of the triune God come from? How do we foster it in ourselves? I want to be that person! I want to be like Isaiah who says, "with my soul I have desired you in the night, yes, by my spirit within me I will seek you early" 26:9. It led me to consider a few things that affect my "loves," and areas that will help me grow:

1. Correct understanding of God and meditation on that knowledge: if I truly grasped the sovereignty of God, the depth of all His attribues, the ministry of Christ, the magnitude of the cross, the glory of a risen savior, the work of sanctification, and God's ultimate purpose, it would change everything. If every moment of my day could be lived in light of eternal, worthy things, just imagine what that day would look like!
2. Correct understanding of myself and those around me: I wish I could see myself and others through Christ. If I really understood Him, I know my love for others would increase tenfold, and I would long to share the gospel with no fear and great hope.
3. Service: I'm selfish. I like to pursue my goals and my comfort first - I'm not the first to jump-in and help with dishes, or shovel bark, or whatever. I need to hold my time and plans with an open hand - a heart dedicated to others can't help but be a passionate one.
4. Trials and Molding: it's easy to be "on-fire" for God and wholly dependent on Him in the midst of hardship, but He demands it of us every moment. Is it possible to have that all-consuming need of God and satisfaction in Him when the waters are calm?

Of course there are other things - prayer, serious study of the Word (though that's a given in reference to point #1), but how do we encourage these things in those around us? How do we instill passion? Do we? How do you make others excited about Christ?