The more commentaries I read concerning Hebrews 10:24-25, the more I come across statements like this:
The reason the meetings of the assembly are not to be neglected is that they provide a communal setting where mutual encouragement and admonition may occur… The entire community must assume responsibility to watch that no one grows weary or becomes apostate. This is possible only when Christians continue to exercise care for one another personally. – William L. Lane, Hebrews 9-13, Word Biblical Commentary vol 47B (Dallas: Word Books, 1991), 290
This is not an isolated conclusion. In fact, the vast majority of commentators recognize the importance of “mutual encouragement and admonition” when the church gathers together. They recognize that the author of Hebrews assumed that this would be the norm for church meetings.
So, why do so few church meetings today provide opportunities for mutual encouragement and admonition?