Hammett and Duesing both do a good describing their perspectives on the marks of a true church. Hammett lists that the true marks of a church are oneness, holiness, catholicity and apostolicity. This sounds like the Acts 2:42 church which we see the emerges of the local church.
“Those who accepted his message were baptized, and about three thousand were added to their number that day.”(oneness, holiness, apostolicity) Acts 2:41 NIV
“They devoted themselves to the apostles’ teaching and to fellowship...(oneness,apostolicity, catholicity). Acts 2:42 NIV
Duesing describes the essence of the true church in two categories the "being" and the "well being". The being are the essentials to what makes a true church. The well being are things
“Those who accepted his message were baptized, and about three thousand were added to their number that day.”(oneness, holiness, apostolicity) Acts 2:41 NIV
“They devoted themselves to the apostles’ teaching and to fellowship...(oneness,apostolicity, catholicity). Acts 2:42 NIV
Duesing describes the essence of the true church in two categories the "being" and the "well being". The being are the essentials to what makes a true church. The well being are things