2nd Peter ch.1

2Pe 1:1  Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ: 
Obtaining = having accepted the free gift of God, note acceptance is an act of will.
2Pe 1:2  Grace and peace be multiplied unto you through the knowledge of God, and of Jesus our Lord,
 Note Peter says that Grace and peace come from the knowledge of God and his Christ here.
2Pe 1:3  According as his divine power hath given unto us all things that pertain unto life and godliness, through the knowledge of him that hath called us to glory and virtue:
 Once again here everything that pertains to life and goodness comes from what? Knowledge of him that called, that is, Christ.
2Pe 1:4  Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
 Thru this knowledge of Christ we were given "great and precious promises"! we partake of the divine nature and escape corruption by applying this knowledge God gave us to our lives. 'tis an act of our will to do this. as the word diligence below indicates.
2Pe 1:5  And beside this, giving all diligence, add to your faith virtue; and to virtue knowledge;
2Pe 1:6  And to knowledge temperance; and to temperance patience; and to patience godliness;
2Pe 1:7  And to godliness brotherly kindness; and to brotherly kindness charity.
2Pe 1:8  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.
 The Spirit calls the Knowledge of God "living water", baptism is a spiritual image of a person getting immersed in the knowledge of god that washes away their sins, and will keep them from sin afterwords too. not that good people won't sin ever anymore but they should be noticeably apart from sin for the most part. one should be following the spirit of living water/knowledge of God more than their former carnal spirit.
2Pe 1:9  But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.
2Pe 1:10  Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:
 God gave us a gift and he will never take it back, but, mystery that it is to me, I guess someone might "forget" this gift in some form or fashion in their will, by choosing to follow the spirit of the age rather that God's holy spirit? would be a shame.
2Pe 1:11  For so an entrance shall be ministered unto you abundantly into the everlasting kingdom of our Lord and Saviour Jesus Christ.
2Pe 1:12  Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth.
 Peter is intent to remind his friends of these facts, despite that fact they know them and are established in the truth. those following the Holy Spirit are never offended by truth, if you find yourself offended by truth, you should realize you need to wash up with that spiritual "living water". because you are not following God's spirit, but the rebellious spirit of the age.
2Pe 1:13  Yea, I think it meet, as long as I am in this tabernacle, to stir you up by putting you in remembrance;
 As long as he lives, Peter desires to stir his fellows up to remember God's holy word. I'm willing to bet they didn't tire of it back then.
2Pe 1:14  Knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath shewed me.
2Pe 1:15  Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance.
2Pe 1:16  For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
 Peter says "we were there, saw it and lived it!  and now report to you accurately the Lord's word. who better to learn from? the report of those there is better and more accurate than any preacher that lives this day. sometime in the future there will come an end times Elijah that is foretold in scripture, who may well be one of the two witnesses mentioned in John's revelation. these will be real honest to goodness prophets, those on the earth at that time would do well to listen to them.
2Pe 1:17  For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased.
2Pe 1:18  And this voice which came from heaven we heard, when we were with him in the holy mount.
2Pe 1:19  We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
 Until the Day Star arises in our hearts, which is a future event that hasn't happened yet, Peter says here that we should read, study, and understand the prophesies God gave to us in the Bible. this 'aint me talkin, but Christ's Apostle Peter.
2Pe 1:20  Knowing this first, that no prophecy of the scripture is of any private interpretation.
2Pe 1:21  For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
 The Holy Spirit moved the prophets of old to write what they wrote. God spoke, and the prophets testified it. now here's a point few want to consider in these days, many people's hearts have grown cold and crusty thanks to the spirit of the age, but God caused the prophets to speak and write his word so people would read it. be cleansed in this living water! Read the word and let the Holy Spirit do it's work to make you understand it.