(Radha-Krishna and the gopis—click to enlarge)
Prabhupāda: With Kṛṣṇa, you can enjoy very nicely. You have seen the picture, how with Kṛṣṇa the gopīs are nicely dancing, enjoying; the cowherd boys are playing. Enjoy with Kṛṣṇa, that is your real enjoyment. But without Kṛṣṇa, when you want to enjoy, that is māyā. That is māyā.
So māyā is there always, and... Because unless there is darkness, you cannot appreciate the quality of brightness; therefore Kṛṣṇa has created darkness, māyā also, so that you can appreciate what is brightness. Two things are required. Without brightness, the darkness cannot be appreciated, and darkness... Without darkness, the brightness cannot be appreciated. The two things are there, side by side. Just like there is sunlight, and here is shadow, side by side. You can remain within the shadow; you can remain within the sunshine. That is your choice.
If we remain in the darkness, then our life is miserable, and if we remain in the light, brightness... Therefore Vedic literature instructs us, tamasi mā: "Don't remain in the dark." Jyotir gama: "Go to the light." So this attempt, Kṛṣṇa consciousness movement, is an attempt to bring people from darkness to the light. So don't misuse this opportunity. Some way or other, you have come in contact with this movement. Properly utilize it. Don't go to the darkness. Always remain in bright light.
(Srila Prabhupada Lecture, Los Angeles, February 10, 1975)