Is There Such a Thing as a Gift You Must Earn?
Galatians 3:15-18

Even human covenants are not altered or set aside after they have been ratified (Gal 3:15)

How much more, then, is God's covenant secure? (Gal 3:16)

The Law (which came later) certainly did not invalidate the Covenant which preceded it (Gal 3:17)

The promised blessings cannot be based on both the Covenant and the Law - They are mutually exclusive! (Gal 3:18)

There is no such thing as a gift that you must earn!