Taking part of communion should remind us of the emotional and physical salvation that Jesus provided for us.
The Lord's Supper comes from a part of the Passover meal that was celebrated only once a year. The early Christian church took Communion weekly and sometimes daily. There is no specific times of the Lord's Supper prescribed in scripture.
As we take Communion, we are proclaiming the Lord's death, and our union with Him and with others through that death.
This is a profession of our faith and there are serious consequences for those who profess something they don't possess.
What makes a person worthy or unworthy is whether or not they is born again. This is also consistent with the doctrine of grace that Paul preached.
It is a dangerous offense for an unbeliever to take the Lord's Supper. When taking Communion, each person should examine themselves to see whether or not they are in the faith (2 Corinthians 13:5).