Sons of Aaron being instructed on the ceremony of animal sacrifice
“…For the sons of Moses and also the sons of Aaron shall offer an acceptable offering and sacrifice in the house of the Lord, which house shall be built unto the Lord in this generation, upon the consecrated spot as I have appointed” D&C 84:31
The Temple Institute ( Hebrew translation: Machon HaMikdash) located in the Jewish quarter of Jerusalem’s Old City, was founded on the principle of action. Rabbi Yisreal Ariel, a distinguished Rabbi and founder and head of the institute since 1987 is paraphrased in the following from the website:
Every generation is obligated to do all within its power towards rebuilding the Holy Temple this, as opposed to those who believe that we must wait for the Messiah to arrive before it can be rebuilt.