93 Saint Thomas Aquinas sought to describe the love made possible by God’s grace as a movement outwards towards another, whereby we consider “the beloved as somehow united to ourselves”. Our affection for others makes us freely desire to seek their good. All this originates in a sense of esteem, an appreciation of the value of the other. This is ultimately the idea behind the word “charity”: those who are loved are “dear” to me; “they are considered of great value”. And “the love whereby someone becomes pleasing ( grata ) to another is the reason why the latter bestows something on him freely ( gratis )”.
Source: Fratelli Tutti (Vatican.va)