Eternal sin
Thomas Aquinas lists, or has responded to, six sins that supposedly go against the Holy Spirit:
Thomas Aquinas explains that the unforgivability of blasphemy against the Holy Spirit means that it removes the entrance to these means of salvation; however, it cannot hinder God in taking away this obstacle by way of a miracle.
Actual sin
In Roman Catholic theology, the "Capital vices" or sins, also known as the "seven deadly sins", are the main roots of sin. They are called capital sins not because they are the greatest sins or necessarily mortal sins, but because all sins are in some way related to at least one of them. These sins are: