涅槃經遊意 1.238

1.238

第六、明「橫竪照」義。明佛在因之月，道初心已能橫照竪照；次入初地，則能一念之中橫照百法，竪照百時；乃至二地，于時至佛地，萬法萬時。

Sixth, an explanation clarifies the meaning of "horizontal and vertical illumination". It explains that while the Buddha was in the causal stage, at the very initial mind of the path he was already able to illuminate horizontally and vertically; next, upon entering the first bhūmi, he was able in a single thought-moment to illuminate a hundred dharmas horizontally and a hundred times vertically; up to the second bhūmi, until at the Buddha-bhūmi [he illuminates] myriad dharmas and myriad times.