2 Peter 3:1
 This second epistle, beloved, I now write unto you; in both which I stir up your pure minds by way of remembrance:
Blessings are promised to the family and posterity of David. These promises relate to Solomon, David’s immediate successor, and the royal line of Judah. But they also relate to Christ, who is often called David and the Son of David. To him, God gave all power in heaven and earth, with authority to execute judgment.
Faith unites the weak believer to Christ, as really as it does the strong one, and purifies the heart of one as truly as of another, and every sincere believer is by his faith justified in the sight of God. Faith worketh godliness and produces effects which no other grace in the soul can do. In Christ, all fulness dwells, and pardon, peace, grace, knowledge, and new principles, are thus given through the Holy Spirit. The promises to those who are partakers of a Divine nature will cause us to inquire whether we are really renewed in the spirit of our minds; let us turn all these promises into prayers for the transforming and purifying grace of the Holy Spirit.
Faith works by and must be seen in love, of God for himself, and of men for God’s sake. Aged persons are apt to be peevish and fretful; therefore need to be on their guard. Though there is no express Scripture for every word or look, there are general rules that all must be ordered.
The epistles most taken up in displaying the glory of the Divine grace, and magnifying the Lord Jesus, are the most particular in pressing the duties of the Christian life. We must never separate the privileges and duties of the gospel.
Paul is directing his discourse to show what sins many are guilty of, notwithstanding their profession and vain pretensions.
A believing, humble, thankful glorying in God is the root and sum of all religion. But proud, vain-glorious boasting in God and his name’s outward profession is the root and sum of all hypocrisy.
Spiritual pride is the most dangerous of all kinds of pride. A great evil of the sins professors is the dishonour is done to God and religion by their not living according to their profession. Many despise their more ignorant Neighbours who rest in a dead form of godliness. Yet, they trust in the form of knowledge, equally void of life and power, while some glory in the gospel, whose unholy lives dishonour God and cause his name to be blasphemed.
The good news is that the Lord Jesus reigns. Christ himself brought these tidings first. His ministers proclaim these good tidings: keeping themselves clean from the pollutions of the world, they are beautiful to those to whom they are sent. Zion’s watchmen could scarcely discern anything of God’s favour through the dark cloud of their afflictions, but now the cloud is scattered, they shall plainly see the performance.
Grace is the free favour of God, and acceptance with him. Mercy, the fruits of the favour, in the pardon of sin, and freedom from all miseries both here and hereafter. And peace is the effect and fruit of mercy.