what are essential elements of a church?

John MacArthur has a post up about ties that bind; things that local churches must have in common. His list is good and includes:

A high view of God
The absolute authority of scripture
Sound doctrine
Personal holiness
Spiritual authority

I don’t think this list, while good, (and the explanations under each topic are outstanding) is complete. the first comment on the post points out the need for a church to be outward focused. I especially liked the comment of Mark Sohmer which was:

Commitment to Reaching Out to the Lost

As Spurgeon said, “If sinners will be damned, at least let them leap to hell over our bodies. And if they will perish, let them perish with our arms around their knees, imploring them to stay. If hell must be filled, at least let it be filled in the teeth of our exertions, and let not one go there unwarned and unprayed for.” 1860.

What else could be added to the list, if anything?