By grace are ye saved through faith; and that
not of yourselves: it is the gift of GOD. "
-Ephesians 2:8
Grace is, therefore, GOD'S unmerited favor - HIS goodness toward those who have no claim on, nor reason to expect, divine favor.
Salvation is not our achievement, but it is a gift from GOD.
It is 'not of ourselves' and "not of works." Salvation is indeed the most extraordinary expression of GOD'S GRACE.