This thing called Grace Are you asking of how it is perceived or how it should be received? Grace by My definition is a divine Gift. A gift from GOD Our Father which NONE can remove or resend. Such a Gift is given to Paul and he so states this in not so many words in Galatians. As he would charge Peter for returning to the nature of the flesh instead of staying true to the nature of the spirit.
Grace is afforded to whosoever will accept the Gift of Christ's crucifixion upon the cross. The Belief of this Gift or the Grace of GOD for God so loved the World that He did give this Gift of Grace; which No man taketh from any other.
This letter if I recall correctly is to do with Circumcision and the uncircumcised. A depiction of the Jews and the Gentiles whom after Christ's death were Made One who are now able to become Sons and no longer a devision or a service unto the Law which saveth None or any Man.
So it is not always simple Grace is a Gift from God Directly! Which can not be Altered. Donnie/ Sinbad the Sailor Man