When seen from the physical world, things of the spiritual world can't be understood. When seen from the spiritual world, things done in the physical world can't be understood.
When a person who believes, sees, he cannot understand a person who does not believe. When a person who does not believe, sees, he cannot understand a person who believes.
When a person who has done something/taken action, sees, cannot understand a person who hasn't taken action. When a person who has not done taken action, sees, cannot understand a person who has taken action. If people have different 'lives' and different 'thinking,' they can't understand [each other] even if they see [each other].
You too. Until you do something, you can't understand the work that must be done. You must do it. Then you will understand.
From a human being's point of view, they can't understand God.They have to put [His] Word to practice. Then they will understand God.