"Why did the ekklesia gather? Most evangelicals, and indeed Christians of nearly all persuasions, traditionally answer that churches meet for worship. Paul's consistent answer was 'to build each other up.' The members met to use their personal endowments from the Spirit for the common good. They prayed, read Scripture, encouraged, sang, taught, and prophesied to one another as the Spirit enabled them. Paul never defined ekklesia in terms of a vertical relationship of worship. The meeting was for one another."
Mark Strom, Reframing Paul, 174.