This is Volume III out of nine in a collection of Studies in Ethics and the Philosophy of Religion which is meant to provide an opportunity for philosophical discussions of a limited length which pursue in some detail specific topics in ethics or the philosophy of religion, or topics which belong to both fields. Originally published in 1973, this text looks at Theology and Intelligibility and discusses a proposition from natural theology; and also a formula which in the context of sacred doctrine is the doctrine of the Holy Trinity.