The Apostle Paul taught that "faith is the substance of things hoped for, the evidence of things not seen." Hebrews 11:1 Faith is a principle of action and power. Whenever we work toward a worthy goal, we exercise faith. I love the idea that Faith is a verb.
Faith is the foundation of each one of our testimonies and we must always "Remember that without faith you can do nothing;" Docterine and Covenants 8:10
"To sustain faith, each of us must be humble and compassionate, kind and generous to the poor and the needy. Faith is further sustained by daily doses of spirituality that come to us as we kneel in prayer. It begins with us as individuals and extends to our families, who need to be solidified in righteousness. Honesty, decency, integrity, and morality are all necessary ingredients of our faith and will provide sanctuary for our souls." James E. Faust, “The Shield of Faith,” Ensign, May 2000
"And now as I said concerning faith—faith is not to have a perfect knowledge of things; therefore if ye have faith ye hope for things which are not seen, which are true." Alma 32:21