I am more afraid that this people have so much confidence in their leaders that they will not inqure for themselves of God whether they are led by him. I am fearful they settle down in a state of blind self-security, trusting their eternal destiny in the hands of their leaders with a reckless confidence that in itself would thwart the purposes of God in their salvation, and weaken that influence they could give to their leaders, did they know for themselves, by the revelations of Jesus, that they are led in the right way. Let every man and woman know, by the whispering of the Spirit of God to themselves, whether their leaders are walking in the path the Lord dictates, or not. (Brigham Young, Journal of Discourse 9:150)

BRIGHAM YOUNG, made in the Tabernacle, Great Salt Lake City, January 12, 1862
http://pt.fairmormon.org/Journal_of_Discourses/9/27

Quote by Elder Faust in Oct '89 conference: http://www.lds.org/general-conference/print/1989/10/continuous-revelation?lang=eng