... Most of you, my brethren, are Elders, Seventies, or High Priests; perhaps there is not a Priest or Teacher present. The reason of this is that when we give the brethren their endowments, we are obliged to confer upon them the Melchizedek Priesthood; but I expect to see the day, when we shall be so situated that we can say to a company of brethren, You can go and receive the ordinances pertaining to the Aaronic order of Priesthood, and then you can go into the world and preach the Gospel, or do something that will prove whether you will honor that Priesthood before you receive more. Now we pass them through the ordinances of both Priesthoods in one day, but this is not as it should be and would [be], if we had a temple wherein to administer these ordinances. But this is all right at present; we should not be satisfied in any other way, and consequently we do according to the circumstances we are placed in.
[Brigham Young, June 11, 1864 , Journal of Discourses, 10:309 as quoted in Anderson, Devery; The Development of LDS Temple Worship, 1846-2000: A Documentary History, http://amzn.to/TempleWorship]