In this verse, Krishna talks about how knowledge can change us. He says that when people understand themselves better and learn about their true nature, it's like a bright light shining in the darkness. This knowledge helps them see the most important truths clearly, just like the sun shining above all the darkness of the night.

Here, "ignorance" means not knowing important things about ourselves and the world around us. When someone learns about themselves deeply, they realize they're connected to something greater and more divine. This understanding makes the darkness of ignorance go away and reveals the most important truths.

Krishna compares this understanding to the rising sun, which makes everything clear and bright after the darkness of the night. Similarly, knowing ourselves deeply brings clarity and wisdom, guiding us towards important truths and freedom.

Overall, this verse tells us that understanding ourselves deeply can change our lives. It helps us see things clearly and brings us closer to the most important truths about life and existence.