What does it mean to be 'enlarged' as Paul says in 2 Corinthians 6:13?
Being enlarged means opening yourselves to the truths Paul was bringing—ready to receive his message. It is a call to open up to those truths, which then leads to separation from unbelievers, those without God and without faith, not necessarily morally bad people.
Les explains that 'be ye also enlarged' means to be ready to open yourselves to the truths Paul was bringing. This openness connects with the call for separation: believers are not to be unequally yoked with unbelievers. Les clarifies that unbelievers are not necessarily awful or bad people; they may be good citizens or morally better than some Christians, but they are ungodly, meaning without God. They are without faith, and without faith it is impossible to please God. So being enlarged involves receiving Paul's truth, which includes separating from those who lack faith.
Now for a recompence in the same, (I speak as unto my children,) be ye also enlarged.