Cattāri Brahmavihārā

8. As long as the sun and the moon have not come to be, there is no shining forth of great light, no great radiance; only darkness and non-seeing prevail. There is no day or night; no months, half months or seasons are distinguishable. But when the sun and the moon have come to be, there is a shining forth of great light, great radiance; darkness and non-seeing are no more. Days, nights, months, half months and seasons come to be distinguishable.
In the same way, as long as the Tathagata, the Noble One, the fully enlightened Buddha has not come to be, there is no shining forth of great light, no great radiance; only darkness and non-seeing prevail. There is no proclaiming, no teaching, no explaining, no setting forth, no opening up, no analysis, no illuminating of the Four Noble Truths.
But when the Tathagata, the Noble One, the fully enlightened Buddha has come to be, there is a shining forth of a great light, a great radiance; darkness and non-seeing are no more. There is a proclaiming, a teaching, an explaining, a setting forth, an opening up, an analysis, an illuminating of the Four Noble Truths.

Samyutta Nikaya V.442

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