Prabhupada's lecture - Śrīmad-Bhāgavatam 1.7.18 - Vṛndāvana, September 15, 1976
That light is Kṛṣṇa. And anything which is not Kṛṣṇa... Kṛṣṇa is everything, but to make a general division, māyā, that is andhakāra.
So we should not remain in māyā. We should remain always in Kṛṣṇa consciousness. Then our life is successful. Otherwise we shall continue the life of darkness, uttamam. Udgata. Tama, darkness. You have to pass over this darkness. Padaṁ padaṁ yad vipadām [SB 10.14.58]. Here in the dark... Just like in the darkness if you walk, in every step there is danger. Every step there is danger. Padaṁ padaṁ yad vipadām. If you want to avoid this dangerous life in darkness, then you must take to Kṛṣṇa consciousness. Kṛṣṇa-sūrya-sama; māyā haya andhakāra. Māyā is andhakāra. Yāhāṅ kṛṣṇa tāhāṅ nāhi māyāra adhikāra. The sūrya, as soon as there is sunshine, the darkness automatically goes away. So if you keep Kṛṣṇa always in view in your brain, within your heart... Sa vai manaḥ kṛṣṇa-padāravindayoḥ [SB 9.4.18]. If you simply keep Kṛṣṇa within the heart... Man-manā bhava mad-bhaktaḥ. Kṛṣṇa says, man-manā bhava mad-bhaktaḥ. Then your life is success. Otherwise, in the darkness, there is always danger in every step. Padaṁ padaṁ yad vipadām.