What knowest thou # 18_JOB_15_09 # What knowest thou, that we know not? [what] understandest thou, which [is] not in us? 
what knowest thou # 46_1CO_07_16 # For what knowest thou, O wife, whether thou shalt save [thy] husband? or how knowest thou, O man, whether thou shalt save [thy] wife?