The systematic theosophy of Plotinus and his successors does not belong to the present article, except so far as it is the presupposition of their mysticism; but, inasmuch as the mysticism of the medieval Church is directly derived from Neoplatonism through the speculations of the pseudo-Dionysius, Neoplatonic mysticism fills an important section in any historical review of the subject.
The idea of a perfect harmony of thinking and being is a presupposition that underlies all knowing but cannot itself be realized in knowledge.
Accordingly the history of philosophy is the presupposition of logic, or the three branches of philosophy form a circle.
That the deists appreciated fully the scope of difficulties in Christian theology and the sacred books is not their most noteworthy feature; but that they made a stand, sometimes cautiously, often with outspoken fearlessness, against the presupposition that the Bible is the religion of Protestants.
The doctrine of Atonement, destined to be the focus of Protestant evangelicalism, has remained undefined in Catholic circles,' an implicate or presupposition, but no part of the explicit and authorized creeds.