Whether a man can sin first of all against the Holy Ghost?

❌ Objection 1 : It would seem that a man cannot sin first of all against the Holy Ghost, without having previously committed other sins. For the natural order requires that one should be moved to perfection from imperfection. This is evident as regards good things, according to Prov. 4:18: "The path of the just, as a shining light, goeth forwards and increases even to perfect day." Now, in evil things, the perfect is the greatest evil, as the Philosopher states (Metaph. v, text. 21). Since then the sin against the Holy Ghost is the most grievous sin, it seems that man comes to commit this sin through committing lesser sins.

❌ Objection 2 : Further, to sin against the Holy Ghost is to sin through certain malice, or through choice. Now man cannot do this until he has sinned many times; for the Philosopher says (Ethic. v, 6,9) that "although a man is able to do unjust deeds, yet he cannot all at once do them as an unjust man does," viz. from choice. Therefore it seems that the sin against the Holy Ghost cannot be committed except after other sins.

❌ Objection 3 : Further, repentance and impenitence are about the same object. But there is no repentance, except about past sins. Therefore the same applies to impenitence which is a species of the sin against the Holy Ghost. Therefore the sin against the Holy Ghost presupposes other sins.