In the time of Moses, a Tabernacle that was transportable was made. The tabernacle was a place where the Israelites could meet with God. The closest thing that we have today are churches and synagogues. I think we miss a little power of the Tabernacle in that comparison, though. When Moses met with God, it was visible for people to see. A cloud came down and covered the tent.
For people to commune with God in this tent of meeting, they would have to give a sacrifice. There could be no defect in the sacrifice. Unless the person made this sacrifice, he could not enter the Tabernacle because he was deemed unclean.
Fast forward several thousand years later to an innocent man hanging on a cross. Beaten, bloodied, ridiculed, and without crime He was given not just a criminal death but a shameful and cursed death. He cried out to God, and died. There was an earthquake, the curtain that kept the most holy place in the temple (a new tabernacle) was torn, and some people even rose from the dead (WHOA!).
Before Christ, people had to make the sacrifice to atone for their sins. It wasn’t enough to make them fully Holy, but it was enough to make them acceptable to God. However, God did something amazing through Christ. Men used to offer sacrifices to God, but in Christ God sacrificed. He atoned for the sins of man, and unlike the sacrifices from men, this sacrifice was enough. It was enough to restore His people to Himself through Himself.
Nowadays, we may not see pillars of fire or clouds that guide us where to go next. However, Christ lives in us through the Holy Spirit. He takes residence in our hearts if we let Him. This residence and communion with God is intimate, miraculous, and mysterious.
If you are feeling unworthy, if you feel like no matter what you do isn’t enough, that’s okay. Nothing we do will be enough, but God made the sacrifice that will forever be enough.
“I appeal to you therefore brothers, by the mercies of God, to present yourself as a living sacrifice, holy and acceptable to God, which is your spiritual worship. Do not be conformed to this world, but be transformed by the renewal of your mind that by testing you discern what is the will of God: what is good, and acceptable, and perfect.” – Romans 12:1-2
The living sacrifice Paul appeals for Christians (specifically the Romans, but I think we can also take application from this) to give is spiritual worship. It is the process of being renewed by Christ, day-to-day, hour-by-hour, minute-by-minute. This isn’t something to be done for God’s acceptance, but it is something to help guide us and transform us.