'Known' in the Bible

and we have known that the law is good, if any one may use it lawfully;

having known this, that for a righteous man law is not set, but for lawless and insubordinate persons, ungodly and sinners, impious and profane, parricides and matricides, men-slayers,

(and if any one his own house how to lead hath not known, how an assembly of God shall he take care of?)