Whether imprudence is a sin?

Objections

Objection 1 : It would seem that imprudence is not a sin. For every sin is voluntary, according to Augustine [*De Vera Relig. xiv]; whereas imprudence is not voluntary, since no man wishes to be imprudent. Therefore imprudence is not a sin.
Objection 2 : Further, none but original sin comes to man with his birth. But imprudence comes to man with his birth, wherefore the young are imprudent; and yet it is not original sin which is opposed to original justice. Therefore imprudence is not a sin.
Objection 3 : Further, every sin is taken away by repentance. But imprudence is not taken away by repentance. Therefore imprudence is not a sin.