2 Corinthians 6:1 [AMP]
LABORING TOGETHER [as God’s fellow workers] with Him then, we beg of you not to receive the grace of God in vain [thatmerciful kindness by which God exerts His holy influence on souls and turns them to Christ, keeping and strengthening them—do not receive it to no purpose].
We so often hear about the abundance of God’s grace; however, here Paul gives a warning about receiving God’s grace without the appropriate reverence and respect due it. I think the way this looks lived out is when we are in a situation like a church service or night at High School camp where you hear the gospel and are convicted, yet push down that conviction not heeding God’s call on you at that moment. This is what it means to receive it with no purpose. The very next verse confirms:
2 Corinthians 6:2 [AMP]
For He says, In the time of favor (of an assured welcome) I have listened to and heeded your call, and I have helped you on the day of deliverance (the day of salvation). Behold, now is truly the time for a gracious welcome and acceptance [of you from God]; behold, now is the day of salvation!
This is that moment – the moment God extends His gracious gift of salvation by forgiving you of all your sins through your acceptance of His Son as your personal sim bearer. Even after salvation I think that ignoring a call God is putting on your life as a born again adopted child of His, can put you in this place of grace applied with no purpose.