Our Natural Poverty and Our Riches in Christ

Full orbed Christian character v7.
Exemplary Christian conduct can exist alongside serious defects - our varying temperaments can incline us to overlook certain sins - we need the kindly exhortations of our brethren.

Unforced generosity a proof of their love v8.
Sincerity of heart is evidenced by gracious actions - 'faith without works is dead' - the Corinthians exhorted to evidence their love for the brethren by gracious and generous giving.

Christ became poor that we might be rich v9.
All love for and generosity towards the brethren springs from an appreciation and apprehension of Christ's rich grace and condescension.