keep knowledge # 20_PRO_05_02 # That thou mayest regard discretion, and [that] thy lips may keep knowledge. 
may keep knowledge # 20_PRO_05_02 # That thou mayest regard discretion, and [that] thy lips may keep knowledge. 
should keep knowledge # 39_MAL_02_07 # For the priest's lips should keep knowledge, and they should seek the law at his mouth: for he [is] the messenger of the LORD of hosts.