2 Corinthians 8:3-4
For I testify that they gave [financial help] to the full limit of their ability, yes and even beyond it. [And they did this] entirely on their own,
2 Corinthians 8:12
For if the eagerness is there, [then] whatever a person has [to give] is acceptable, and not what he does not have.
2 Corinthians 8:17
For he not only accepted our urging, but being very diligent himself, he went to you of his own accord [i.e. Titus had wanted to go to Corinth even before being urged to].
2 Corinthians 9:5
So, I thought it necessary to urge the brothers [See verse 3] to visit you ahead of time and arrange beforehand for your previously promised generous gift. Then it will be ready [when I arrive] as a generously given gift and not as something given grudgingly.