佛說觀佛三昧海經 4.3

4.3

佛告父王：「云何觀如來放常光相？如來今者，為未來世諸凡夫人，當現少光，彼諸凡夫當學是觀，如是觀者亦如今日見佛光相無有異也。」

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."