The second rhetorical question, Is it not you?
confirms what was already implicit in the first rhetorical question, namely that the Thessalonian believers are Paul’s hope, joy, and crown. This assertion is affirmed even more emphatically in 1 Thessalonians 2:20: For you are our glory and joy.
19 For what is our hope or joy or crown of boasting before our Lord Jesus at his coming? Is it not you?