"Who has faith as a grain of mustard seed? None of us, not one of us; no, not one. And that is the first principle of the gospel of life and salvation and yet there is not a soul of us on earth that has been able to rise to the capacity, to the humility, to the inspiration and to the power of Almighty God to comprehend and to live up to this first principle of the gospel of life. We are all babes in this principle of the gospel. We are only beginning, the best of us, to know something of this principle of life and salvation, this principle of power. By faith, we are told, the worlds were made. Who of us have faith to do much of anything? Our faith is so limited that we can scarcely live the little principles of the gospel that God has revealed to us that are necessary for social peace and enjoyment. We have scarcely faith to carry out these little principles that are revealed to us for the government of our every day lives. The Lord has to bear with us and to be patient with us and to teach us here a little and there a little, line upon line and precept upon precept that we may eventually gain that faith that was once delivered to the Saints by which the mouths of lions were stopped, and the heat of the fiery furnace was assuaged; by which the wrath of the wicked was turned away from the people and servants of God, and by which wonders were accomplished. (Collected Discourses v2, Joseph F. Smith November 1, 1891)"
"As I think about faith, this principle of power, I am obliged to believe that it is an intelligent force. Of what kind I do not know. But it is superior to and overrules all other forces of which we know. It is the principle, the force, by which the dead are restored to life. (Conference Report, J. Rueben Clark April 1960)"