Peter gave us a battle plan for wrestling against spiritual powers to rescue the people not born of God. The primary theme of Peter's teaching is stated well in Chapter 3, verse 4.
Organize your lives around the hidden person of the heart with the incorruptible beauty of a calm, quiet, deliberate spirit, which is very valuable to God.
Peter's teaching applies to us today.
I am the author of the web site perfectingprayer.com. I am also the author of the books:
The Guiding Into Truth Work of the Holy Spirit
Effective Prayer
Ceased from sin: Living to do God's will
Spiritual Warfare: Sowing
The Truth About Eternal Life
Go the Way You Should Go
Prepare for the End of the Age
Spiritual Growth
The Disciples We Should Make and How We Should Make Them
The Good News
The Path of Life
First Peter
The Scroll and Horsemen of the Book of Revelation
Spirit-guided Exegesis