St. Therese Lisieux wrote that "in time of aridity when I am incapable of praying, of practicing virtue, I seek little opportunities... a smile, a pleasant word when inclined to be silent and show weariness. If I find no opportunities, I at least tell Him again and again that I love Him..."
Even if it feels like the fire has gone out, it can still rekindle - often when we least expect it. It is our job to keep throwing kindling on, even if that is all we can manage. Christ's heart burns bright and hot; it takes Him merely passing by for a moment, a simple brush, and the dry wood of our hearts will light again.
We are the creatures, not the Creator. We are the servants, not the Master. It is not our place to complain when the Master of the house of our hearts steps out for a while; we must simply go on and keep it tidy for when He returns.
If, like I've been lately, you're experience a dry spell, offer a prayer with me:
When it seems You have left, help me to find You. When my soul's fire is dwindling in tiredness or boredom, help me wait for You to stoke it brighter. Master, while Your house is quiet and still, help me keep it ready always for Your return.