en_tn_condensed/pro/12/23.md

conceals his knowledge

"does not tell everything he knows"

The hand of the diligent

"Hand" represents what a person does -- his works. AT: "Diligent people" (See: rc://en/ta/man/translate/figs-metonymy)

will be put to forced labor

"Forced labor" describes what a person must do who is not free to do what he wants. AT: "will become a slave" (See: rc://en/ta/man/translate/figs-metonymy)