"He himself bore our sins in his body on the tree, so that we might die to sins and live for righteousness; by his wounds you have been healed." NIV translation
Peter reminds us that Jesus submitted even to the point of giving up His life for those that hated Him and treated Him badly. Because He took away our sins and paid for them, we are healed and can have a right relationship with God. Peter also reminds us that because of that we can and should "die to sins and live for righteousness". To "live for righteousness" is where your every thought and action is based on the will of God and His Word. God also gave us the power to do so through the gift of the Holy Spirit.
"For you were like sheep going astray, but now you have returned to the Shepherd and Overseer of your souls." NIV translation
Without proper guidance, sheep will just wander off and perish. It is not that they are that stupid, it is simply that they focus on what is directly in front of them and miss the larger picture.
But, when properly guided, they can be very productive and the same things are true of man.
Left to our own, we can see the effects of sin all around us and the death that goes with it but, when properly guided by God through the Holy Spirit, we all can be productive for the kingdom. If you are ready to answer the call to be holy, you can start by pressing the reset button on your life and coming back to the Shepherd.