A report of a speech given by Joseph Smith in Washington DC:

"He said very little of rewards and punishments; but one conclusion, from what he did say, was irresistible—he contended throughout, that everything which had a beginning must have an ending; and consequently if the punishment of man commenced in the next world, it must, according to his logic and belief have an end... and he again repeated that all who would follow the precepts of the Bible, whether Mormon or not, would assuredly be saved.

There was much in his precepts, if they were followed, that would soften the asperities of man towards man, and that would tend to make him a more rational being than he is generally found to be. There was no violence, no fury, no denunciation. His religion appears to be the religion of meekness, lowliness, and mild persuasion.

The Mormon Bible, he said, was communicated to him, direct from heaven. If there was such a thing on earth, as the author of it, then he (Smith) was the author; but the idea that he wished to impress was, that he had penned it as dictated by God."

History of the Church entry here: https://byustudies.byu.edu/hc/4/5.html

The account was partially quoted in the June 1994 Ensign:

http://www.lds.org/ldsorg/v/index.jsp?hideNav=1&locale=180&sourceId=d486425e0848b010VgnVCM1000004d82620a____&vgnextoid=2354fccf2b7db010VgnVCM1000004d82620aRCRD#footnote15