Ephesians 2:1-3

As for you, you were dead in your transgressions and sins, in which you used to live when you followed the ways of this world and of the ruler of the kingdom of the air, the spirit who is now at work in those who are disobedient. All of us also lived among them at one time, gratifying the cravings of our sinful nature and following its desires and thoughts. Like the rest, we were by nature objects of wrath.

(v1-3, NIV)

Living in transgressions and sins means that you are dead. Paul is still speaking to the Christians, so this is something they used to be. They used to be dead because of sins and transgressions. This was their past life and it is the past life for all followers of Christ. All followers of Christ used to live in transgressions and sins. All followers of Christ used to follow the ways of this world. However, there was a turning point in your life if you are a follower of Christ. The turning point in our lives changed from following the ways of this world.

This means that we can look to those who are not saved yet and know that they are following the ways of this world. This isn't a means to judge them or to elevate ourselves, but to know of their nature. We know that we used to be like that, so we are no better than they are. Maybe this should even encourage us to share with them, though of course we should share with them for many reasons. We are instructed to spread the gospel and make disciples of all the nations.