Existing knowledge will affect our ability to absorb new knowledge. For example, children who don’t understand anything have the strongest learning ability. However, due to the obstacles of inherent thinking in adulthood, adults will not be able to absorb new knowledge. The ability to absorb new knowledge is also low.

So, this sentence actually encourages people to open their minds and forget what they already know before gaining new knowledge. To be afraid, you need to be curious.