There’s an old story about Akiva, the rabbi, who had been in the village to gather some supplies. Walking back to his cottage, he absentmindedly took the wrong path. Suddenly, a voice came through the darkness: “Who are you, and why are you here?”
Shocked to awareness, Akiva realized he had wandered into the Roman garrison, and the voice had come from the young sentry keeping guard. But being a rabbi, he answered the question with another question: “How much do they pay you to stand guard and ask that question of all who approach?”
The sentry, now seeing that this was not an intruder but a rabbi, answered meekly, “Five drachmas a week, sir.”
At that point the rabbi offered, “Young man, I will double your pay if you come with me, stand in front of my cottage, and ask me that question each morning as I begin my day: ‘Who are you, and why are you here?’”