Summary of text [comment] page 70

Schoonenberg wrote that sin is the opposite of love. Sin, in its fullness, is a loss of the life of grace, hence it excludes supernatural love. The unity of nature [disposition] and grace [person, conscience] also means that sin excludes human natural love.

Natural love always welcomes the offer of grace and is assumed into supernatural love.

[How to appreciate this? Perhaps the intersection of recognition and participation affords the model.]