Paul in his Letter to Timothy considered it important and recommended all Christians to be amiable to everyone. Lovable is a person who, from their affectionate, gentle, caring and affectionate attitude, is worthy of being loved.
As a "pedagogue" of young people, Don Bosco knew by experience that it is not enough to love. "Pedagogical charity" requires more; "make oneself loved and lovable; that is, know how to translate love into behavior and acts of generosity, kindness, in a methodology of friendliness, familiarity through dialogue and the joy of living together "(cit. ACS 310, pp 11-12).
It is, in the end, "to be loved", the result of a spirituality and apostolic methodology that is especially original.
This was to be Don Bosco's desire for the Salesians: "study how to make yourself loved" by young people, a fundamental aspect of his educational proposal.
Amiability produces peace and is contagious, has the power to "disarm hearts"; in other words, courtesy has the ability to free others from negative emotions because the other lowers their hands, calms down, before a kind gesture.