Whether a solemn penance can be repeated?

Objections

Objection 1 : It would seem that a solemn penance can be repeated. For those sacraments which do not imprint a character, can be solemnized a second time, such as the Eucharist, Extreme Unction and the like. But Penance does not imprint a character, therefore it can be solemnized over again.
Objection 2 : Further, penance is solemnized on account of the gravity and publicity of the sin. Now, after doing penance, a person may commit the same sins over again, or even more grievous sins. Therefore the solemn penance should be imposed again.