The next sentence of this phrase is "the reason is unclear".

"If you don't turn on the lamp, it won't turn on, and if you don't argue, you won't be able to understand" is a famous saying by Ye Shaoweng, which expresses that if you don't work hard and think, you won't be able to gain true understanding and wise insights.

The saying "If the lamp is not turned on, it will not light up" means that if you do not light the lamp, you will not be able to see the things around you clearly. The lamp here can be understood as knowledge and wisdom. Only through learning and thinking can we gain real insight and insight. "The reason is not clear" emphasizes the importance of understanding. If you don't think dialectically and explore the essence and causes of things, you can't truly understand the truth of things.