I wouldn't say I've been "on fire" (whatever that means) for Jesus in a while.
Throughout the last 10 years of my life, I've been at lots of different places with my life with Christ.
I have been that guy out on campus doing open-air preaching (though not the "you're all going to hell" type preaching).
I have been the charismatic believer who had deeply emotional encounters with the Spirit that manifested in strange ways (i.e. slain in the Spirit), encounters which I still believe were real.
I have been the intellectual seminary student studying all the relevant sources, sometimes to the point of arrogance towards others not "in the know" (whether an atheist or the Christian in some country Georgia church), other times to the point of not knowing what to believe anymore.
I have also dealt with severe mental illness (bipolar disorder) that nearly destroyed my marriage and life, during which I found very little support from a lot of the Christian "community" I belonged to (though there were some very important individuals who stood by me).
Now I find myself preparing to become a high school teacher, as opposed to the pastor or biblical scholar I thought I'd be just a few years ago. I haven't attended church much at all the past 2 years because my current job in retail does not allow it. I rarely read my Bible and don't often pray unless I have a strong need to. I don't have any of the feelings of a "strong" or "on-fire" relationship with God. Yet, I certainly consider myself a Christian, still think it contains the most truth, and my wife and I are trying our best to raise our son with a knowledge of Jesus.
I still have certain convictions which are very strong, such as recently when a lot of Christians I know were celebrating the death of Osama Bin Laden. My wife and I both are very much of a pacifistic bent, and the pro-militarism of our society disgusts me. Yet I have friends who are like: "how are you going to speak out on that issue when you post rap songs on the internet that have cursing and glorify drugs, murder, etc.?" While for the most part I feel like such friends are wrong and have a very restricted view of art, a part of me wonders if they have a point.
Sometimes I feel like the biggest hypocrite, but I remind myself that's it's still a relationship with Christ. Sometimes in a relationship, you're not particularly close to the other person. I wish I was closer to him (sometimes), but right now now I find myself kind of in this apathetic place.
Or perhaps it's not apathy at all but that I mentally connect being "on fire" for Christ to all those things -- zealous witnessing, charismatic fervor, legalistic attitudes on cursing, etc. -- that I just can't go back to. And maybe I just haven't fully become comfortable with this new way of being Christian that I am experiencing.
Anyway: thoughts of a dry brain in a dry season.
TL; DR.