There are only two states you can have - alive and dead - we are born again (1Co 15:22, 2Co 5:17, Tit 3:5). We were transfered out of darkness (Col 1:13). We cause grief to the Spirit of God when we sin (Eph 4:30, Eph 4:25). Believer must decide to lay aside former conduct. Out of a desire to please we often lie. To other members of the body we need to speak the truth (Eph 4:25). We can walk in the darkness or the light (1Jn 1:3-10). Anger, even righteous indignation, should be cut short. Stealing needs to turn to giving. Forgiveness is the cure for bitterness. These thing grieve the Spirit.
More than any book Ephesians reveals the blessings from God based on our relationship with Jesus Christ by grace through faith. Eph 1:3 is the a key verse. Other key verses by chapter include Eph 2:8 Eph 3:19 Eph 4:1 Eph 5:18 and Eph 6:10-11.