"Think of Abraham, our ancestor. Wasn’t it his action which really justified him in God’s sight when his faith led him to offer his son Isaac on the altar? Can’t you see that his faith and his actions were, so to speak, partners—that his faith was implemented by his deed? That is what the scripture means when it says: ‘Abraham believed God, and it was accounted to him for righteousness. And he was called the friend of God.’ A man is justified before God by what he does as well as by what he believes." James 2:21-24
How does that last verse - 2:24 - read in the language of the original Greek?
"You see that a man is set right by works, and not by faith alone."
Let's examine that idea, step by step: If Jesus came to live the works of the Kingdom of Heaven, then we can see precisely what the life of Heaven is like by reading His exploits in the four Gospels. Yet external works were not enough for Jesus, were they? He wanted to get those works inside the hearts of those who'd repent and believe in Him.
So He died to end the separating influence and condemnation of Sin, thus giving us the possibility of being made a pure dwelling-place of His Presence. And then He rose to conquer human death, and so that He might be alive to reign over the Kingdom and rule it from within us. Then, ascending, He took His place at the head of all Kingdom of Heaven affairs, and, in sending the Holy Spirit, took His place directly in the hearts of His people...
So the reason that our justification - our being "set right" - is found in both faith and works is because, in faith and works, we are a union-place of Jesus-then and Jesus-now: we show the Kingdom as it was in the three years of His personal ministry - when He was making humanity right - and the Kingdom as it is now - with Jesus forever on the throne.
It is our joy - and our job - to act as the junction for the inner and outer workings of the Kingdom of Heaven. Let us be living that life with relish this Easter Week!