What do all Paul's epistles conclude after comparing law vs grace: contrary things can't co-exist in peace?

Law and Grace are two different covenant, under the law there is no way a person can become rightiousness in God's sight. because the letter kills, but under grace the spirit give life and frees us from the bondage of sin and death of the law, we live in the newness of life born again of the spirit alive spiritualy eternal life is Gods gift to all who come to him through faith in Jesus. 1 john 5:11,13