Thomas Oestreich,
Catholic Encyclopedia
(1913)
“ An Abbot who presides only over such persons, ecclesiastical and lay, as are attached to his monastery, belongs to the lowest grade, and his jurisdiction carries with it what is called the simple passive exemption (exemptio passiva) from the authority of the diocesan bishop. If an Abbot's jurisdiction extends beyond the limits of his abbey, over the inhabitants—clergy and laity—of a certain district or territory which forms an integral part of a bishop's diocese, he belongs to the middle grade (prælatus quasi nullius diœcesis) and his exemption is termed active (exemptio activa) . ”
