What do Christians mean by the expression "to be on fire for God/Jesus/Christ", and is there a Biblical basis for this concept?

I've heard the expression "to be on fire for God/Jesus/Christ" several times. A quick search can turn up many examples, for instance: > "Please help. I'm so confused, Pastor Tim. I made a profession of faith several years ago. **I was on fire for Jesus**, loved Him, felt His presence with me... I think. Over several years, the zeal lessened and the harder days of Christian life came. I battled with pornography, pride, and doubting. I was in the fight of faith and glad to be. But then discouragement set in, and I slowly neglected prayer and Scripture reading and the battles became harder." > > Source: https://illbehonest.com/was-i-deceived-by-a-false-profession > Pray with me, please. Breathe on me, breath of God, and **set my soul on fire**. Amen. > > I choose to call this sermon “Spiritual Arson: **Setting the World on Fire for Christ**.” God willing, as the sermon unfolds, you will come to understand the reason for the title. > > Source: https://thewordmadefresh.org/sermons/spiritual-arson-setting-the-world-on-fire-for-christ/ > 5 ways to **get on fire for God** > > **Have you lost your fire**? Did you once **burn brightly for Jesus** where you would have done anything for Him, and yet now going to church once a week seems a rather difficult commitment? Do you ever think perhaps one day I’ll **get my fire back** and really serve God but right now I’m happy to just go through the motions of nominal Christianity? If so does it bother you that you’ve settled into this lifestyle? In first world suburbia it’s quite easy to fall into this rut, but I want to tell you how you can get out of it, and **get back to burning hot for Jesus** all the days of your life. > > Source: https://www.newnatureministries.org/blog-post/5-ways-to-get-on-fire-for-god/ What do Christians who use this expression normally mean by it? Is it merely a statement about their personal psychological state (emotions), or does it carry a deeper theological/spiritual significance, denoting some kind of profound spiritual state that every Christian should strive to attain? Lastly, is there a Biblical basis for this concept?