Irenicum, to the lovers of truth and peace heart-divisions opened in the causes and…

First, the separation must be from want of charity. By faith especially we are united to Christ our head, and by charity to one another. If a man appears departing from any fundamental Article of our faith which joined him to his Head, he is to be judged an Heretic. So by his appearing to depart from that love by which he was joined in communion with the members,¹ he is to be judged a Schismatic. If his departure proceeds from his love of God, his love to his Saints, and his own soul, yea his love to that very Church from whence he departs, as sometimes it may, witnessing in a gracious way against evil in it, he is far from the guilt of Schism.²

First, the separtion must be from want of charity. By faith especially we are united to Christ our head, and by charity to one another. If a man appeares departing from any fundamentall Article of our faith which joyned him to his Head, he is to bee judged an Heretick. So by his appearing to depart from that love by which he was joyned in communion with the members,¹ he is to be judged a Schismatick. If his departure proceeds from his love of God, his love to his Saints, and his owne soule, yea his love to that very Church from whence he departs, as sometimes it may, witnessing in a gratious way against evill in it, he is farre from the guilt of Schisme.²

1. 1Schismatis peocatum speciale vitium est, charitati oppositum. Aquin. 2. 2 q. 29. Art. 1. conclus.
2. 2Schismatici discissionibus iniquis a fraterna charitate dissiliunt. Aug. lib de Fide & Symbolo, cap. 10.

If you say, love is a secret thing, we cannot judge of what is in the heart.