Thematic Bible: Why the law was given

Consequently, just as condemnation for all people came through one transgression, so too through the one righteous act came righteousness leading to life for all people. For just as through the disobedience of the one man many were made sinners, so also through the obedience of one man many will be made righteous. Now the law came in so that the transgression may increase, but where sin increased, grace multiplied all the more, read more.
so that just as sin reigned in death, so also grace will reign through righteousness to eternal life through Jesus Christ our Lord.