God is not slack when it comes to his promises, rather he is long suffering.
This is for the benefit of mankind. He knows the time when all things will end, but that day is unknown to man. God’s warning to all men is to be ready and watching for that day.
Jesus said, "Heaven and earth shall pass away: but my words shall not pass away. But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father" (Mark 13:31, 32).
The Apostle Paul also wrote, "And the times of this ignorance God winked at; but now commandeth all men everywhere to repent: Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead" (Acts 17:30, 31).
Those scoffers of Peter’s day needed to take advantage of the time God was allowing them to make their preparations for eternity. Instead of mocking this longsuffering of God, they should have thanked God for the opportunity.
God desires all men to be saved: "For this is good and acceptable in the sight of God our Savior; Who will have all men to be saved, and to come unto the knowledge of the truth" (1 Tim. 2:3,4).
God wants all to be saved, and those who say otherwise have little or no knowledge of the scriptures.
The Lord will come unexpectedly, hence the need to be prepared for that day. Jesus had used this same phraseology while on the earth (Matt. 24:43, 44).
The verb "will come" is in emphatic position in the Greek text – whatever else occurs, coming surely is the Lord. The day of the Lord is the day chosen by God in which Jesus will appear in the clouds (Acts 1:11). This phrase in the Old Testament usually denoted judgment.
On this day, the universe and the atmosphere where birds fly will pass away with a great noise.
In his commentary on 1 and 2, Peter Guy N. Woods wrote: "Accompanying its dissolution there will be ‘a great noise.’ The word thus translated is rhoizedon, an onomatopoeic term, in which the sound denotes the meaning. Its kindred noun, rhoidsos, was used in classical Greek of the whizzing of an arrow, the whirring rush of wings, the sound of the wind, and the murmur of waters. Here it describes the crash of dissolving worlds and the tremendous roar of flames as they consume the earth."
The elements, the basic component of material matter, will be dissolved. Science knows of more than 100 chemical elements that exist.
Matter is comprised of atoms, which are comprised of sub-atomic particles. Every atom and sub-atomic particle will be destroyed on this day.
On the day of creation, these particles came together, and on the Day of the Lord, they will be dissolved. On this day, the earth will be burned up.
Some think it impossible that such a thing could occur, but God has promised it to happen. Not only will God’s creation be destroyed, but all that man has accomplished will perish.
Great men have built great cities. Men have raised great monuments to honor politicians, war heroes and such. All will perish in the flames.
The question is many times asked as to how God will accomplish this task. Some have speculated that man will do it himself with bombs or other weapons.
It is enough to know that God has said it will occur,. Man must be ready for that day.