Under the  Law (The Ten Commandments), God  demanded righteousness from man. Under grace (the person of Jesus Christ and his works on our behalf), God  provided righteousness  for man through faith alone in Jesus Christ! Under The Law, everything depended on man and his obedience. But under grace, everything depends on Jesus and what he did and who he is on the cross. The Law demands, but will not lift a finger to help fullfill that demand. While grace imparts and has accomplished the works on your behalf.