Exodus 3:1-2

1 Now Moses was tending the flock of Jethro his father-in-law, the priest of Midian. And he led the flock to the back of the desert, and came to Horeb, the mountain of God. 2 And the Angel of the LORD appeared to him in a flame of fire from the midst of a bush. So he looked, and behold, the bush was burning with fire, but the bush was not consumed.

This event happened in the midst of common and ordinary toil. The Lord delights in seeking a person on an ordinary road. His will, sometimes, takes the most subtle form, often without sensational happenings. We have duties in the valleys that require work and endurance, and often it is during such labors that the divine fire leaps out at our feet.