2 Corinthians 8:6

‘Insomuch that we exhorted Titus, that as he made a beginning before, so he would also complete in you this grace also.'

Indeed so deep was the impact of the Macedonian way of giving that it moved him to send Titus to Corinth in the hope of producing the same effect among them in regard to the Collection which he had already put into motion when he had been with them. This beginning had been made when he had previously been in Corinth, and now Paul hoped that he could stir the Corinthians to also revealing the work of God's grace within them, revealed by the generosity of their own gracious giving.

‘This grace also.' As well as the grace resulting from his ministering to the saints.

(It is clear on consideration that for a brief while Paul has expressed himself a little tactlessly, forgetting the touchiness of the Corinthians. Instead of letting them know how he has used them as a stirring example to others, as he does later, he has given the impression that all the credit is due to the Macedonians. This is something he will shortly recognise and strive to correct in chapter 9, and explains his change of tone there).