Justification by faith, not by works.

Rom. 3:19-22.

Vain are the hopes the sons of men
On their own works have built;
Their hearts by nature all unclean,
And all their actions guilt.

Let Jew and Gentile stop their mouths
Without a murm'ring word,
And the whole race of Adam stand
Guilty before the Lord.

In vain we ask God's righteous law
To justify us now;
Since to convince and to condemn
Is all the law can do.

Jesus, how glorious is thy grace!
When in thy name we trust,
Our faith receives a righteousness
That makes the sinner just.

Isaac Watts

http://www.poemhunter.com/poem/hymn-94/