Summa Theologiae by St. Thomas Aquinas
SS: Treatise On The Theological Virtues
Q[13] Of The Sin Of Blasphemy, In General
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We must now consider the sin of blasphemy, which is opposed to the confession of faith; and (1) blasphemy in general, (2) that blasphemy which is called the sin against the Holy Ghost.

Under the first head there are four points of inquiry:

A[1] Whether blasphemy is opposed to the confession of faith?

A[2] Whether blasphemy is always a mortal sin?

A[3] Whether blasphemy is the most grievous sin?

A[4] Whether blasphemy is in the damned?