The door to everlasting life and salvation stands open, and the Lord Jesus welcomes all who approach. But that door isn't going to stay open forever. In Luke 13, Jesus explains that when that door is shut (on the last day), many will knock and say "Let us in! We went to church and participated in the life of our congregation" and Jesus will say "Depart from me; I never knew you!"

Our assurance of salvation then rests only in this: That we know and trust Jesus as our only hope in life and death, and because of that he knows us and will never cast us out.