觀彌勒上生兜率天經贊 2.129

2.129

贊曰：顯佛常業。彼恒光明都無暗夕，以起睡相得其夜名。佛即不然，常度天子。

The commentary says: This shows the Buddha's constant occupation. There, it is always radiant with light and entirely devoid of dark night; it only gets the name 'night' because the characteristics of sleep arise. The Buddha, however, is not like that, but constantly delivers the devaputras.