Tis_Bearself
Patron
You’re right on the second part: Catholics must be in a state of grace in order to receive the Eucharist.I don’t believe one obtains grace FROM the Eucharist but rather it is the other way around: one must BE in a state of grace to partake of the Eucharist. Catholics, correct me if I’m wrong about the first part.
Wrong on the first part: Catholics get grace from the Sacraments. Holy Eucharist is a Sacrament and receiving it transmits God’s grace to you.
Being “in a state of grace” means basically, no mortal sin on your soul. If you are in mortal sin, you cannot receive grace because grace cannot co-exist with mortal sin in you. If you are not in mortal sin then you are in a state of grace and you can receive additional grace, for instance through reception of the Sacraments like Eucharist, Matrimony etc.
There are different types of grace (sanctifying, actual, sacramental etc) and various articles on that but it’s getting a little deep in the weeds for this thread.