"I have learned to wait upon the King of kings before I wait on my earthly sovereign."
The phrase "wait upon" was common in the days of serfdom and slavery. It means to "be attendant to" or "to be a servant of." It was the custom of Lord Dartmouth to receive his marching orders every morning from God through prayer and meditation. His time with God meant more to Lord Dartmouth than his time with King George II.
His is a practice worth our imitation.