[RnMomof7]

Because the Word of God is truth, and if grace saves, but not everyone is saved, then the definition of grace must be more than just God's unconditional benevolence to us. I Peter 5:5 says that God bestows his grace on those who are humble, not everyone.

Are you avoiding my question?

Define Grace and mercy..

Also why is it one or the other? Can God not have mercy on whom he will have mercy? Why is it all or nothing?

So back to square 1

What is Grace and what is Mercy .

[jkl1122]

Grace is "an expression of divine benevolence". Mercy is the kindness God shows to those who don't deserve it.

I don't know what you mean by "why is it one or the other"?
Yes, God can have mercy on anyone he chooses.