He is not asking people to invite Him into some deep recess of their heart through praying a prayer. Instead, He is reproving a group of people who congregate in His name and commanding them to repent of their apathy toward Him (they are lukewarm), their spiritual blindness (they cannot see that they are wretched, miserable, poor, blind, and naked), and their materialism and pride (they say they are rich and have become wealthy and have need of nothing).
