अव्यक्ताद्व्यक्तयः सर्वाः प्रभवन्त्यहरागमे।
रात्र्यागमे प्रलीयन्ते तत्रैवाव्यक्तसंज्ञके।।8.18।।
।।8.18।।ब्रह्माजीके दिनके आरम्भकालमें अव्यक्त(ब्रह्माजीके सूक्ष्मशरीर) से सम्पूर्ण प्राणी पैदा होते हैं और ब्रह्माजीकी रातके आरम्भकालमें उसी अव्यक्तमें सम्पूर्ण प्राणी लीन हो जाते हैं।
What subsequently is the process? Lord Krishna is answering. From the unmanifest form of the effect is the cause. Therefore from the unmanifest which is the cause, all created beings, moving or stationary come into existence. When is this? At the commencement of Brahmas day every 4 billion 320 million years and at the end of Brahmas day all created beings are merged back into the unmanifest for 4 billion 320 million years. This verse clarifies that the knowers of day and night also know the cycle of the unmanifest and the manifest and what happens to all created beings.