so that contrariwise ye should rather forgive him and comfort him, lest by any means such a one should be swallowed up with his overmuch sorrow.

So instead, you ought to forgive and comfort him, so that he will not be overwhelmed by excessive sorrow.

so that, on the contrary, it is rather for you to forgive and to comfort, lest by over abundant sorrow such a one may be swallowed up;

so that on the contrary ye should rather shew grace and encourage, lest perhaps such a one should be swallowed up with excessive grief.