"The things of God cannot be understood by the spirit of men. It is impossible to always measure and weigh all spiritual things by man’s yardstick of scales. Admittedly, our direct and positive information is limited. I have wished the Lord had given us a little more clarity in the matter. But for me, it is enough. The prophets for 133 years of the church have maintained the position of the prophet of the Restoration that the Negro could not hold the Priesthood nor have the temple ordinances which are preparatory for exaltation. I believe in the living prophets as much or almost more than the dead ones. They are here to clarify and reaffirm. I have served with and under three of them. The doctrine or policy has not varied in my memory. I know it could. I know the Lord could change his policy and release the ban and forgive the possible error, which brought about the deprivation. If the time comes, that he will do, I am sure. These smart members who would force the issue, and there are many of them, cheapen the issue and certainly bring into contempt the sacred principle of revelation and divine authority.

Spencer w. Kimball, Teachings of Spencer W. Kimball, June 1963., p. 448

The quote is, in part, inaccurate (Joseph Smith didn't introduce the ban). But I keep it for the line where President Kimball suggests that the ban might have been an error.