"Then the word of the Lord came to him, and He said to him, ‘What are you doing here, Elijah?’” (1 Kings 19:9b)
This should remind us of John chapter one: “In the beginning was the Word, and the Word was with God, and the Word was God.” Then later we read, “The Word became flesh and dwelled among us, and we beheld His glory, the glory as of the only begotten One of the Father.”
John was referring to Jesus, the Son of God, the Messiah, as this Word of God. That then suggests that Jesus, the Son of God, was the One who was in that cave with Elijah, the One who spoke to him.
Let’s translate this for ourselves. On those days when you find yourself in a proverbial dark cave, on the side of a mountain, in the middle of a desert, you can count on the fact that you as a believer will not be alone. Jesus will be there with you. And that is enough.