But I determined this with myself, that I would not come again to you in heaviness.
With myself - rather, 'for myself' to spare myself pain: in contrast to "you" (2 Corinthians 1:23: cf. 2 Corinthians 2:2).
Not come again to you in heaviness - `sorrow.' He had already paid them one visit in sorrow since his coming for the first time to Corinth. At that visit he warned them 'he would not spare if he should come again' (notes, 2 Corinthians 13:2: cf. 2 Corinthians 12:14; 2 Corinthians 13:1). See 'Introduction' to the first letter. The "in heaviness" implies mutual pain-they grieving him, and he them (cf. 2 Corinthians 2:2 and 2 Corinthians 2:5). In this verse he accounts for having postponed his visit, following up 2 Corinthians 1:23.