Romans 3:22-24

Romans 3:22-24. For there is no difference: for all have sinned, and come short of the glory of God; being justified freely by his grace through the redemption that is in Christ Jesus:

I have heard persons ask, "Why do you say, ‘free grace’? If it is grace, it must be free." Well, we say "free grace", because the Scripture says, "freely by his grace"; and as the Lord never uses superfluous words, we conceive that we are not guilty of tautology when we say "free grace,"