The art of printing along with the other inventions and discoveries which preceded the coming of Moroni and the restoration of the Gospel, had to be revealed before the Church could be established in the earth. The framing of the American Constitution, we well know, was by divine inspiration. And thus, revealing line upon line and precept upon precept, the Lord prepared the way for the restoration of His work in fulness in the earth.

( Source:

Joseph Fielding Smith, The Signs of the Times 157

)