“Many think a prophet must be a great deal better than any body else... I love that man better who swears a stream as long as my arm, yet deals justice to his neighbors and mercifully deals his substance to the poor, than the smooth-faced hypocrite. I do not want you to think that I’m very righteous, for I am not. There was one good man, and his name was Jesus”

Joseph Smith
(Documentary History of the Church, 5:401).

Sermon Delivered on 21 May 1843
http://speeches.byu.edu/?act=viewitem&id=1123

Partial quote:
http://www.lds.org/ldsorg/v/index.jsp?vgnextoid=2354fccf2b7db010VgnVCM1000004d82620aRCRD&locale=0&sourceId=aba167700817b010VgnVCM1000004d82620a____&hideNav=1#footnote11