Meaning is expanded and completed by context and verse ten definitely does add and expand on the theme in saint Paul's argument about grace in Ephesians 2:1-10.
And you were dead, through the crimes and the sins which used to make up your way of life when you were living by the principles of this world, obeying the ruler who dominates the air, the spirit who is at work in those who rebel. We too were all among them once, living only by our natural inclinations, obeying the demands of human self-indulgence and our own whim; our nature made us no less liable to God's retribution than the rest of the world. But God, being rich in faithful love, through the great love with which he loved us, even when we were dead in our sins, brought us to life with Christ -- it is through grace that you have been saved- and raised us up with him and gave us a place with him in heaven, in Christ Jesus. This was to show for all ages to come, through his goodness towards us in Christ Jesus, how extraordinarily rich he is in grace. Because it is by grace that you have been saved, through faith; not by anything of your own, but by a gift from God; not by anything that you have done, so that nobody can claim the credit. We are God's work of art, created in Christ Jesus for the good works which God has already designated to make up our way of life.
(Ephesians 2:1-10)
And saint James argues that doing good works does justify. That's why he wrote
How does it help, my brothers, when someone who has never done a single good act claims to have faith? Will that faith bring salvation? If one of the brothers or one of the sisters is in need of clothes and has not enough food to live on, and one of you says to them, 'I wish you well; keep yourself warm and eat plenty,' without giving them these bare necessities of life, then what good is that? In the same way faith, if good deeds do not go with it, is quite dead. But someone may say: So you have faith and I have good deeds? Show me this faith of yours without deeds, then! It is by my deeds that I will show you my faith. You believe in the one God -- that is creditable enough, but even the demons have the same belief, and they tremble with fear. Fool! Would you not like to know that faith without deeds is useless? Was not Abraham our father justified by his deed, because he offered his son Isaac on the altar? So you can see that his faith was working together with his deeds; his faith became perfect by what he did. In this way the scripture was fulfilled: Abraham put his faith in God, and this was considered as making him upright; and he received the name 'friend of God'. You see now that it is by deeds, and not only by believing, that someone is justified. There is another example of the same kind: Rahab the prostitute, was she not justified by her deeds because she welcomed the messengers and showed them a different way to leave? As a body without a spirit is dead, so is faith without deeds.
(James 2:14-26)