The heading comes from John 3:16, perhaps the most famous verse in the Bible. It indicates that salvation is by faith and not by works. That is, one cannot ever achieve rightness before God by one's own effort. What one cannot forget is the rest of the text - John 3:16 does not stand alone:

For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.

And this is the condemnation, that light [Jesus Christ] is come into the world, and men loved darkness rather than light, because their deeds were evil.

For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.

But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.