What Does It Mean to “Say Nothing but Repentance unto This Generation”?

Doctrine and Covenants 11:9

9 Say nothing but repentance unto this generation. Keep my commandments, and assist to bring forth my work, according to my commandments, and you shall be blessed.

President Joseph Fielding Smith wrote:

“Hyrum Smith, like others of that day, was commanded to ‘[say] nothing but repentance unto this generation.’ This was the cry of John the Baptist. When the Lord calls upon His servants to cry nothing but repentance, He does not mean that they may not cry baptism, and call upon the people to obey the commandments of the Lord, but He wishes that all that they say and do be in the spirit of bringing the people to repentance. Any missionary who fails to do this in his ministry is derelict in his duty.”

(Church History and Modern Revelation, 2 vols. [1953], 1:56–57.)