KeU 4.4
तस्यैष आदेशो यदेतद्विद्युतो व्यद्युतदा३इतीन् न्यमीमिषदा३ इत्यधिदैवतम्
Thus the teaching of Brahman is here illustrated in regard to the Devas. He dashed like lightning, and appeared and disappeared just as the eye winks.
Translated by Swami Paramananda
This is the teaching of Brahman, with regard to the gods (mythological): It is that which now flashes forth in the lightning, and now vanishes again.
Translated by F. Max Müller