“Being enriched in every thing to all bountifulness, which causeth through us thanksgiving to God.”
King James Version (KJV)
9:11 Which worketh by us thanksgiving to God - Both from us who distribute, and them who receive, your bounty.
2Co 9:11 Being enriched in every thing. This explains how the fruits of righteousnesses are increased. As they are enriched it tends to "bountifulness", and this causeth "thanksgiving to God".