How do we know that 'ekklesia' does not mean universal church?

'Ekklesia', as used in the New Testament, is a term that emphasizes a local, visible assembly of believers. Historical and etymological studies suggest that the term was historically understood in contrast to a universal concept. When Jesus specified 'ekklesia' in Matthew 16:18, he intentionally chose not to use 'panagurus', a word that would imply a universal assembly. This choice indicates a focus on particular congregations that are autonomous and visible rather than a vague, universal body of believers. Furthermore, the New Testament practice of identifying local congregations supports this interpretation, showing a structured governance and active participation among those gathered.