The Apostle Peter wrote his second and final letter to his disciples when he was well aware of his imminent death.
In his first heart felt letter, He made reference to his "departure" revealed to him prior to Christ's Ascension.
Now Peter implores the disciples to remember:
"if ye do these things, ye will never stumble."
Peter pleads for the disciples to be "all the more diligent".
Charles Spurgeon's commentary:
"If thou wouldest enjoy the eminent grace of the full assurance of faith, under the blessed Spirit's influence, and assistance, do what the Scripture tells thee, "Give diligence." Take care that thy faith is of the right kind—that it is not a mere belief of doctrine, but a simple faith, depending on Christ, and on Christ alone. Give diligent heed to thy courage. Plead with God that He would give thee the face of a lion, that thou mayest, with a consciousness of right, go on boldly. Study well the Scriptures, and get knowledge; for a knowledge of doctrine will tend very much to confirm faith. Try to understand God's Word; let it dwell in thy heart richly.
When thou hast done this, "Add to thy knowledge temperance." Take heed to thy body: be temperate without. Take heed to thy soul: be temperate within. Get temperance of lip, life, heart, and thought. Add to this, by God's Holy Spirit, patience; ask Him to give thee that patience which endureth affliction, which, when it is tried, shall come forth as gold. Array yourself with patience, that you may not murmur nor be depressed in your afflictions. When that grace is won look to godliness. Godliness is something more than religion.
Make God's glory your object in life; live in His sight; dwell close to Him; seek for fellowship with Him; and thou hast "godliness"; and to that add brotherly love. Have a love to all the saints: and add to that a charity, which openeth its arms to all men, and loves their souls. When you are adorned with these jewels, and just in proportion as you practise these heavenly virtues, will you come to know by clearest evidence "your calling and election." "Give diligence."
5 Yea, and for this very cause adding on your part all diligence, in your faith supply virtue; and in your virtue knowledge;2Peter 1:5-12
6 and in your knowledge self-control; and in your self-control patience; and in your patience godliness;
7 and in your godliness brotherly kindness; and in your brotherly kindness love.
8 For if these things are yours and abound, they make you to be not idle nor unfruitful unto the knowledge of our Lord Jesus Christ.
9 For he that lacketh these things is blind, seeing only what is near, having forgotten the cleansing from his old sins.
10 Wherefore, brethren, give the more diligence to make your calling and election sure: for if ye do these things, ye shall never stumble:
11 for thus shall be richly supplied unto you the entrance into the eternal kingdom of our Lord and Saviour Jesus Christ.
12 Wherefore I shall be ready always to put you in remembrance of these things, though ye know them, and are established in the truth which is with you.