20210420 困知勉行 Kon’chi benkou
困知 can be willingness to learn something through toiling.
勉行 can be working and practicing earnestly and diligently what has been learned.
Connotation can be; a recommendations for even less gifted persons should strive to learn and encourage such people to practice what had learned.
The source is the classical Chinese philosophical book “Chuuyou in Japanese, Zhong Yong in the then Chinese, Doctrine of the Mean.”