Not that Paul did not grieve over the offender; but he desires to emphasize the fact that the injury caused by the sin was not to him personally, but to the Church.
But in part, that I may not overcharge you all (ἀλλὰ ἀπὸ μέρους ἵνα μὴ ἐπιβαρῶ πάντας ὑμᾶς)
For overcharge, Rev., press too heavily, in order to bring out more distinctly the idea of the verb, laying a burden (βάρος) upon. Overcharge, however, is not incorrect, though possibly ambiguous in the light of the various uses of charge. Charge is from the Latin carrus a wagon. Compare the low Latin carricare to load a wagon, and carica a freight-ship. Hence charge is a load; compare the interchange of charge and load applied to the contents of a gun. So cargo, and caricature, which is an exaggerated or overloaded drawing. Hence expense, cost, commission, accusation, all implying a burden, either of pecuniary or of other responsibility, or of guilt. In part does not refer to Paul, as if he had said, “You have not grieved me alone and principally, but in part, since my sorrow is shared by the Church.” With in part is to be construed, parenthetically, that I press not too heavily, that is, on the offender: the whole clause being intended to mitigate the charge against the offender of having wounded the whole Church. Thus you all depends upon he hath caused sorrow, not upon that I press not too heavily upon. Render, as Rev., He hath caused sorrow, not to me, but in part (that I press not too heavily) to you all.