佛說觀佛三昧海經 4.3

4.3

The Buddha said to his royal father: "How does one contemplate the Tathāgata's mark of emitting constant light? The Tathāgata now, for the sake of all ordinary people of future eras, will manifest a small light. Those ordinary people should train in this contemplation; contemplating in this way is no different from seeing the marks of the Buddha's light today."