76. Therefore, brethren, likeness of nature can be
attacked by no cavil, and the Son cannot be said to lack the true
qualities of the Father’s nature because He is like Him. No
real likeness exists where there is no equality of nature, and equality
of nature cannot exist unless it imply unity, not unity of person but
of kind. It is right to believe, religious to feel, and wholesome
to confess, that we do not deny that the substance of the Father and
the Son is one because it is similar, and that it is similar because
they are one.