Insisting that God is inside man, man is always inside himself.

By insisting that God transcends man, man has transcended himself.
If we take any other doctrine that has been called old-fashioned we shall find the case the same.

It is the same, for instance, in the deep matter of the Trinity.

Unitarians (a sect never to be mentioned without a special respect for their distinguished intellectual dignity and high intellectual honour) are often reformers by the accident that throws so many small sects into such an attitude.

But there is nothing in the least liberal or akin to reform in the substitution of pure monotheism for the Trinity.