Here is a historical example dialog from the Dzogchen tradition.  The following occurred in Tibet a long time ago. (Reprinted from Dzogchen & Padmasambhava by Sogyal Rinpoche). Nyoshul Lungtok was a very great Dzogchen master, who followed his teacher Patrul Rinpoche for about eighteen years.  Nyoshul Lungtok would keep telling Patrul Rinpoche that he had not yet got the main point, of realizing Rigpa. Maybe he had, but he really wanted to be sure, so he kept on asking him. Then Patrul Rinpoche gave him the introduction. It happened one evening whilst Patrul Rinpoche was staying up in one of the retreat centers above the Dzogchen monastery. It was a beautiful night; the sky was clear, and the stars were very bright. It was very quiet, and the sound of solitude was heightened by the distant barking of a dog from the monastery below.

Nyoshui Lungtok had not asked him anything that evening, and Patrul Rinpoche called him over, saying "Didn't you tell me that you still hadn't got the main point of the practice of Dzogchen?" Nyoshul Lungtok replied: "Yes, that's right".

"It's very simple", he said, and lying down on the ground, he beckoned to him: "My son, come and lie down here like your father" So Nyoshul Lungtok did so. Then Patrul Rinpoche asked him, in a very affectionate way: "Do you see the stars in the sky?"

"Yes"

"Do you hear the dogs barking from the Dzogchen monastery?"

"Yes"

"Do you hear what I am saying to you?"

"Yes"

"Well, the nature of Dzogpachenpo is just - simply this."

At this moment, everything fell into place, and instantaneously Nyoshul Lungtok was completely realized.