Board Thread:Questions and Answers/@comment-26816767-20171010220133/@comment-2601:42:801:4CF7:3C5E:840C:DC72:A5BD-20190130190916

It is love; if you read the manga (I don't remember which chapter), there are Q&As on the edge of the page, and at one point someone asked which commandment Meliodas possessed; it was love.