As has been pointed out in a previous post, the Abrahamic Covenant is administered in the temple. Sometimes we refer to what we receive in the temple as an endowment because it is a gift from God to us. Just as the Gift of The Holy Ghost is given in an ordinance, the full blessing of the ordinance is not realized until the Holy Ghost actually comes to the person to function in their life. So it is with the endowment, there are blessings and gifts which are to be attendant with the ordinance as pointed out by the Prophet Joseph Smith,
Remember, you are not to go to their nations till you receive your endowments. Tarry at Kirtland until you are endowed with power from on high. You need a fountain of wisdom, knowledge and intelligence such as you never had. Relative to the endowment, I make a remark or two, that there may be no mistake. The world cannot receive the things of God. He can endow you without worldly pomp or great parade. He can give you that wisdom, that intelligence, and that power, which characterized the ancient saints, and now characterizes the inhabitants of the upper world.
(Joseph Smith, History of The Church of Jesus Christ of Latter-day Saints, 7 vols., introduction and notes by B. H. Roberts, 2:, p.197)
Again, the Prophet had this to say about the endowment,
(click on image to enlarge)