'By Grace' in the Bible

But to one that works the reward is not accounted by grace but by debt.

Therefore it is by faith that it may be by grace, that the promise may be sure to all the posterity, not to that of the law only but to that of the faith of Abraham, who is a father of us all,

but not as the fall so also is the gift; for if by the fall of one the many died, much more the grace of God and the gift by grace which is of the one man Jesus Christ, abounded to the many;

but if by grace, no longer by works; for otherwise grace is no longer grace; but if by works, it is no longer grace; for otherwise a work is no longer a work.