Whether a second marriage is lawful?

Objections

Objection 1 : It would seem that a second marriage is unlawful. Because we should judge of things according to truth. Now Chrysostom [*Hom. xxxii in the Opus Imperfectum falsely ascribed to St. John Chrysostom] says that "to take a second husband is in truth fornication," which is unlawful. Therefore neither is a second marriage lawful.
Objection 2 : Further, whatever is not good is unlawful. Now Ambrose [*On 1 Cor. 7:40 and De Viduis] says that a second marriage is not good. Therefore it is unlawful.
Objection 3 : Further, no one should be debarred from being present at such things as are becoming and lawful. Yet priests are debarred from being present at second marriages, as stated in the text (Sent. iv, D, 42). Therefore they are unlawful.
Objection 4 : Further, no one incurs a penalty save for sin. Now a person incurs the penalty of irregularity on account of being married twice. Therefore a second marriage is unlawful.