It's no wonder that Albert Einstein said, "Imagination is more important than knowledge."
Because imagination is originated from thinking outside the box, caused by experiment or making mistakes, which leads to cause and effect, and then, establishes the truth.
So, this truth becomes knowledge for other people to learn ....
Therefore, "knowledge" is caused by the experiment or trial (trial and error), which become cause and effect without thinking outside the box and the truth.
Perhaps, knowledge you earn might not be the real knowledge.