Thematic Bible: Why the law was given

So then as through one transgression there resulted condemnation to all men, even so through one act of righteousness there resulted justification of life to all men. For as through the one man's disobedience the many were made sinners, even so through the obedience of the One the many will be made righteous. The Law came in so that the transgression would increase; but where sin increased, grace abounded all the more, read more.
so that, as sin reigned in death, even so grace would reign through righteousness to eternal life through Jesus Christ our Lord.