Pure Hearts, Clean Hands, and Temple Altars.
“In the first recorded revelation of this, the last dispensation, our Lord instructed Joseph Smith in what we regard as perhaps the greatest work of this dispensation: to seal the living to their families and progenitors. (See Doctrine and Covenants 2.) Inscribed on brass plaques in the entry of the Canadian Alberta Temple are these significant words written by Orson F. Whitney, an Apostle of eighty years ago:
“Hearts must be pure to come within these walls,
Where spreads a feast unknown to festive halls.
Freely partake, for freely God hath given,
And taste the holy joys that tell of heaven.
Here learn of Him who triumphed o’er the grave,
And unto men the keys, the kingdom gave;
Joined here by powers that past and present bind
The living and the dead perfection find.”~Orson F. Whitney~
These tender words remind those who enter the temple of significant truths about their service in the temple: that all who enter may do so feeling the love of our Heavenly Father.“Hearts must be pure.” With this phrase Elder Whitney teaches the importance of effective preparation to attend the temple. We who would attend the temple must be living in a manner which helps us be worthy to enter and fully partake of the feast of which he spoke.”
~David B. Haight~
https://www.lds.org/general-conference/1992/04/come-to-the-house-of-the-lord?lang=eng