God, according to the Bible, is not just one person, but he is three persons in one God. That is the great mystery of the Trinity.
The Trinity is revealed to us only in the Bible. God has revealed some things to us through nature and through conscience. But the Trinity is not among them. This he has revealed to us by supernatural revelation and by supernatural revelation alone.
We can, it is true, detect something in the doctrine of the Trinity that serves to render clearer and richer even what nature and conscience reveal. Nature and conscience reveal, in a revelation which, it is true, sinful man seldom receives, a personal and holy God, Creator of the world. But how can a personal and holy being exist entirely alone?
We ought to be exceedingly cautious about such considerations. Though God is a person, he is a person very different from us finite persons, and I am not sure that we could ever have said, on the basis of any general revelation in nature and conscience, that an infinite person could not have existed entirely alone.
Within the Word of God, it is in the New Testament that the doctrine of the Trinity is taught. There are hints of it in the Old Testament, but they are only hints, and it was left to the New Testament for this precious doctrine to be clearly revealed.
In the New Testament, the doctrine is taught with the utmost clearness; and the doctrine is presupposed even more than it is expressly taught. That is, the New Testament is founded throughout on the doctrine of the Trinity, and the doctrine was really established by the great facts of the incarnation of the Son of God and the work of the Holy Spirit even before it was enunciated in words.
Only the smallest part of the teaching of the New Testament about ...1
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