The Corinthian believers excelled in everything they had-faith, good preaching (speech), much knowledge, much earnestness, much love. Paul wanted them to also be leaders in giving. Giving is a natural response of love. Paul did not order the Corinthians to give, but he encouraged them to prove that their love was sincere. When you love someone, you want to give him or her your time and attention and to provide for his or her needs. If you refuse to help, your love is not as genuine as you say.
Since you excel in so many ways—in your faith, your gifted speakers, your knowledge, your enthusiasm, and your love from us—I want you to excel also in this gracious act of giving. I am not commanding you to do this. But I am testing how genuine your love is by comparing it with the eagerness of the other churches. (2 Corinthians 8:7, 8 NLT)