God saved you by his grace when you believed. And you can’t take credit for this; it is a gift from God. ~Ephesians 2:8
Let us then approach the throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need.
What is God's grace?
Grace is something we do not deserve; it is God's unmerited favor. Grace is the undeserved favor that He has shown us by sending His son to die for us, to provide atonement for our sin. I have often heard Grace described as the pardon that a governor of a state or the president can give to a guilty prisoner who is facing execution for a crime that he or she is most certainly guilty of. God pardons us in that same way.
I also believe that His grace distinguishes Christianity from every other religion; no other religion that I know of offers forgiveness of sin freely.
Why does God give grace?
Why does God offer grace? Because that is just the way He is. It is his nature. God is love. It's very difficult for some of us to understand, (I often cannot comprehend it) but grace comes from true love.
How can God give grace? How can a God, who is perfect and hates sin, give grace to sinners when sin is such an offense to him? Our limited understanding of what real love is tells us that God can only love us if we are being good boys and girls. This is perhaps the most awesome aspect of grace. You know that you are not perfect, and you know that when do try to be a good person you eventually fail. All people do. God knows this.
All that we can say is that God has chosen to give us grace, and he is sovereign. Even when we were contaminated and infected with sin, he saw something in us to love.
How effective is grace? Totally effective, always and for everyone, no matter what they have done. There are no exceptions! For someone to think that they are too far gone to be reached by God's grace is to think that Jesus' sacrifice was not enough. That is just not possible. We have been made holy through the sacrifice of the body of Jesus Christ once for all.
"You see, at just the right time, when we were still powerless, Christ died for the ungodly. Very rarely will anyone die for a righteous man, though for a good man someone might possibly dare to die. But God demonstrates his own love for us in this: While we were still sinners, Christ died for us."
- Romans 5:6-7
We understand what love is when we realize that Christ gave his life for us. -1 John 3:16