Therefore, as ye abound in every thing, in faith, and utterance, and knowledge, and in all diligence, and in your love to us, see that ye abound in this grace also.
Therefore - Greek, 'But' х alla (G243)]: I foreknew ye would not disappoint my good opinion of you. 'BUT as,' etc.
In faith (2 Corinthians 1:24).
Utterance (note, 1 Corinthians 1:5) - not 'doctrine.'
Knowledge (1 Corinthians 8:1).
Diligence - in everything that is good.
Your love to us - literally, 'love from you (i:e., on your part) in us' (i:e., which is felt in the case of us).