What is the unforgivable sin?

When I was taking confirmation classes, the person who was administrating it told us that if if damned the Holy Spirit you will burn in hell for eternity? Is this true???

Your teacher was referring to the “blasphemy against the Spirit”.

The *Catechism of the Catholic Church * no. 1864 says: “Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven.” There are no limits to the mercy of God, but anyone who deliberately refuses to accept his mercy by repenting, rejects the forgiveness of his sins and the salvation offered by the Holy Spirit. Such hardness of heart can lead to final impenitence and eternal loss”.

Recommended reading:

The Unforgivable Sin The Unforgivable Sin

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