NET
20 For no one is declared righteous before him by the works of the law, for through the law comes the knowledge of sin.
Darby
20 Wherefore by works of law no flesh shall be justified before him; for by law [is] knowledge of sin.
KJV
20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law [is] the knowledge of sin.