On February 14, 1853, Wilford Woodruff attended the groundbreaking and dedication ceremony of the Salt Lake City Utah temple. He wrote in his journal, 

“The saints met upon the temple block in a vast body to break the ground for another temple. President Young arose and addressed the people and said, ‘I would just as well build a temple that would cost a million dollars if I knew we should be driven from it in a month by our enemies as though we should occupy it for a thousand years. It is all the same with me for when the Lord commands us to do anything we should do it just as freely without asking the whys & whether we have the privilege of enjoying it or not.’”

Even though the Saints didn’t know whether they would be able to use, or even finish the temple, they knew that God had commanded them to build it. 

When is a time you have had to have faith in something without knowing the outcome?