“And you were dead in the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience— among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind.” – Ephesians 2:1-3
And you were dead in the trespasses and sins in which you once walked, – Here Paul says that the Ephesian believers (and, by implication, you and I) were once dead in our sins.
Following the course of this world, – Being dead to God we were following the “course of this world.”
Following the prince of the power of the air, – Being dead to God we were gladly following Satan.
The spirit that is now at work in the sons of disobedience – This provides a further description of Satan and his work.
Among whom we all once lived in the passions of our flesh, – We lived among and were at one point “sons of disobedience.” Being sons of disobedience we made our choices based on “the passions of our flesh.”
Carrying out the desires of the body and the mind – Again, as sons of disobedience we lived in the sinful desires of our body and our mind (for more on the state of our sinful mind see Romans 8:7-8).
And were by nature children of wrath, – We are born enemies of God (Romans 5:10, 8:7-8). We naturally abide under God’s wrath, making us “children of wrath.” In our natural state we joyfully disobey God (Genesis 6:4) and are subject to the whole of His just and loving wrath.
Like the rest of mankind. – This is the state everyone on the planet is born into – enemies of God, hating God (Romans 3:9-20, 23). Everyone, by nature, makes their choice based on their sinful desires.