One day in December 2015, the respected Comrade Kim Jong Un gave officials a precious explanation on self-development.

Saying that self-development is the most powerful strength that makes oneself strong, Kim Jong Un stressed that one can develop on his own only when he has self-development.

He said that without self-development, they can neither safeguard revolutionary nature of the working class nor build a powerful socialist country with success. He also said that, like an organism that cannot live without water and air, revolutionaries cannot shape their ways on their own but become a mere vegetable if they don’t have self-development.