“In ourselves we are not fit for heaven, either before or after conversion. God’s standard is perfection and we cannot reach it. Neither by good works nor by a virtuous life can we qualify to be citizens of heaven. But one of the wonderful things that happens when we accept Christ is that God hereafter links us with His Son. He places us in Christ. The Lord Jesus then becomes our fitness for God’s presence. We are “‘complete in Him” (Col. 2:10). If we have Him, we don’t need anything else to make us eligible. It is what He has done, not what we must do that counts. It is His merit, not ours. It is because the Father sees us in Him that we are qualified to be “partakers of the inheritance of the saints in the light” (Col. 1:12). We are as fit for heaven as God can make us because Christ is our fitness and He cannot be improved on.”
-from p.32-33 of “My Heart, My Life, My All” by William MacDonald.