"When the penitent shows a willingness to accept the moral teaching, especially in the case of one who habitually frequents the sacrament and demonstrates trust with regard to the spiritual help it offers, it is good to instill confidence in divine Providence and be supportive, in order to help the penitent to examine himself honestly before God. For this purpose it will be necessary to verify the solidity of the motives inducing a limitation of fatherhood or motherhood, and the liceity of the methods chosen to distance or avoid a new birth. Special difficulties are presented by cases of cooperation in the sin of a spouse who voluntarily renders the unitive act infecund. In the first place, it is necessary to distinguish cooperation in the proper sense, from violence or unjust imposition on the part of one of the spouses, which the other spouse in fact cannot resist. This cooperation can be licit when the three following conditions are jointly met: 1. when the action of the cooperating spouse is not already illicit in itself; 2. when proportionally grave reasons exist for cooperating in the sin of the other spouse; 3. when one is seeking to help the other spouse to desist from such conduct (patiently, with prayer, charity and dialogue; although not necessarily in that moment, nor on every single occasion). Furthermore, it is necessary to carefully evaluate the question of cooperation in evil when recourse is made to means which can have an abortifacient effect."