Lets take a look at what Joseph said. I had omitted this in the quote in the Doctrine of Christ thread due to its length.
Lets look at what Paul said in 2 Peter 1.
Calling and Election - Temples The Doctrine of Election¶ St Paul exhorts us to make our Calling & Election shure. This is that sealing power spoken of by Paul in other places (See Eph I. 13.14. In whom ye also trusted, that after ye heard the work of truth; the gospel of your salvation, in whom also after that ye believed ye were sealed with that Holy Spirit of promise. Which is the earnest of our inheritance, until the redemption of the purchased possession unto the praise of his glory.) That we may be sealed up unto the day of redemption, this principle ought. (in its proper place) to be taught, for God hath not revealed any thing to Joseph, but what he will make known unto the Twelve & even the least Saint may know all things as fast as he is able to--bear them. for the day must come when no man need say to his neighbor know ye the Lord for all shall know him (who Remain) from the least to the greatest, How is this to be done? It is to be done by this sealing power & the other comforter spoken of which will be manifest by Revelation. (Joseph Smith, June 27, 1839))
4 Whereby are given unto us exceeding great and preciouspromises: that by these ye might be partakers of the divinenature, having escaped the corruption that is in the world throughlust.Interesting enough he just defined what a blind guide was in verse 9. And if you follow a blind guide you both will fall into a ditch. Secondly, those who have their C&E Sure will never fall. Is this the kind of hope that gives an anchor to the soul that you shall never fall?
5 And beside this, giving all diligence, add to your faith virtue; and to virtue knowledge;
6 And to knowledge temperance; and to temperance patience; and to patience godliness;
7 And to godliness brotherly kindness; and to brotherly kindnesscharity.
8 For if these things be in you, and abound, they make you that ye shall neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ.
9 But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.
10 Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall neverfall:
Calling and Election
Now, there is some grand secret here, and keys to unlock the subject. Notwithstanding the apostle exhorts them to add to their faith, virtue, knowledge, temperance, etc., yet he exhorts them to make their calling and election sure. And though they had heard an audible voice from heaven bearing testimony that Jesus was the Son of God [Mt 17:5], yet he says we have a more sure word of prophecy, whereunto ye do well that ye take heed as unto a light shining in a dark place. Now, wherein could they have a more sure word of prophecy than to hear the voice of God saying, This is my beloved Son?
Now for the secret and grand key. Though they might hear the voice of God and know that Jesus was the Son of God, this would be no evidence that their calling and election was made sure, that they were sealed in the heavens and had the promise of eternal life in the kingdom of God. Then, having this promised sealed unto them, it was an anchor to the soul, sure and steadfast. Though the thunders might roll and lightnings flash, and earthquakes bellow, and war gather thick around, yet this hope and knowledge would support the soul in every hour of trial, trouble and tribulation. Then knowledge through our Lord and Savior Jesus Christ is the grand key that unlocks the glories and mysteries of the kingdom of heaven.
Compare this principle once with Christendom at the present day, and where are they, with all their boasted religion, piety and sacredness while at the same time they are crying out against prophets, apostles, angels, revelations, prophesying and visions, etc. Why, they are just ripening for the damnation of hell. They will be damned, for they reject the most glorious principle of the Gospel of Jesus Christ and treat with disdain and trample under foot the key that unlocks the heavens and puts in our possession the glories of the celestial world. Yes, I say, such will be damned, with all their professed godliness. Then I would exhort you to go on and continue to call upon God until you make your calling and election sure for yourselves, by obtaining this more sure word of prophecy, and wait patiently for the promise until you obtain it. (Teachings of the Prophet Joseph Smith, 297-298)Finally
Further studying: http://emp.byui.edu/marrottr/CallElectSurJSBRMc.htm
UPDATED: Feb 21 2014
My Favorite quote on the subject.
“There are three grand secrets lying in this chapter, [2 Peter 1] which no man can dig out, unless by the light of revelation, and which unlock the whole chapter as the things that are written are only hints of things which existed in the prophet’s mind, which are not written concerning eternal glory . . . Paul ascended into the third heavens, and he could understand the three principal rounds of Jacob’s ladder—the telestial, the terrestrial, and the celestial glories or kingdoms, where Paul saw and heard things which were not lawful for him to utter. I could explain a hundred fold more than I ever have of the glories of the kingdoms manifested to me in the vision, were I permitted, and were the people prepared to receive them. The Lord deals with this people as a tender parent with a child, communicating light and intelligence and the knowledge of his ways as they can bear it. The inhabitants of the earth are asleep; they know not the day of their visitation. The Lord hath set the bow in the cloud for a sign that while it shall be seen, seed time and harvest, summer and winter shall not fail; but when it shall disappear woe to that generation, for behold the end cometh quickly. Contend earnestly for the like precious faith with the Apostle Peter, ‘and add to your faith virtue,’ knowledge, temperance, patience, godliness, brotherly kindness, charity; ‘for if these things be in you, and abound, they make you that ye shall neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ.’ Another point, after having all these qualifications, he lays this injunction upon the people ‘to make your calling and election sure.’ He is emphatic upon this subject—after adding all this virtue, knowledge, etc., ‘Make your calling and election sure.’ What is the secret—the starting point? ‘According as His divine power hath given unto us all things that pertain unto life and godliness.’ How did he obtain all things? Through the knowledge of Him who hath called him. There could not anything be given, pertaining to life and godliness, without knowledge. Woe! woe! woe to Christendom!—especially the divines and priests if this be true. Salvation is for a man to be saved from all his enemies; for until a man can triumph over death, he is not saved. A knowledge of the priesthood alone will do this . . . We have no claim in our eternal compact, in relation to eternal things, unless our actions and contracts and all things tend to this. But after all this, you have got to make your calling and election sure. If this injunction would lie largely on those to whom it was spoken, how much more those of the present generation! 1st key: Knowledge is the power of salvation. 2nd key: Make your calling and election sure. 3rd key: It is one thing to be on the mount and hear the excellent voice, etc., and another to hear the voice declare to you, You have a part and lot in that kingdom” (TPJS, 304-6).