Hebrews 4:16 Let us therefore come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need.
I believe it was Adrian Rogers I heard say “Grace is God giving us what we do not deserve. Mercy is God not giving us what we do.” Grace is a word that can separate some denominations. Grace is what God has given us through Christ. There was no other way. There are some out there who rest of God’s grace, living their worldly ways, resting in the idea that a merciful God will rescue them before it is too late. But if they had truly have a repentant heart, they will no longer have that desire to walk in sin and rest on God’s grace.
As sinful as we are at heart, we could never keep the Law of the commandments to perfection. God demands perfection, so He provided us the only way to attain it, through Christ. Matthew Henry said “Mercy and grace are the things that we want, mercy to pardon all our sins and grace to purify our souls.” We cannot live without either for our time here, or for the life hereafter.