whom not having known you love; in whom, though now you don't see him, yet believing, you rejoice greatly with joy unspeakable and full of glory--
Not living as you used to live when you were ignorant of the truth of God. Not living as you used to live before you were born again by the work of God's Holy Spirit within your life.You see, the natural man is body, mind and spirit. The mind being ruled over by the body and the body appetites. The born-again man is a spiritual man. He's born by the Spirit. And born again means that you are now living a spirit-mind-body existence. Prior to being born again, you lived a body-mind-spirit. Body-mind-spirit; mind controlled by the body and the body appetites. Being born again you now live a spirit-mind-body existence. The body doesn't rule anymore. You're not ruled by the lust of your flesh. You found that life is more than just eating and drinking.But now ruled by the Spirit, you now have the mind of the Spirit and your mind now is on things of the Spirit. They that are of the Spirit do mind the things of the Spirit. They that are of the flesh do mind the things of the flesh. But the mind of the flesh is death, but the mind of the Spirit is life and joy and peace.So Peter here is saying, As obedient children, don't fashion your life after the former life, which was lived after the lust of your flesh, governed over by your flesh; your mind and life governed by your fleshly desires.And as you look around at the world today, the world apart from Christ is a world that is governed by the desires of their flesh. That's what a person lives for, to fulfill their fleshly need. That's what the world talks about.