152. Friendship is no fleeting or temporary relationship, but one that is stable, firm and faithful, and matures with the passage of time. A relationship of affection that brings us together and a generous love that makes us seek the good of our friend. Friends may be quite different from one another, but they always have things in common that draw them closer in mutual openness and trust.[Cf. Saint Thomas Aquinas, Summa Theologiae, II-II, q. 23, art. 1]
This is an excellent summary of the aspiration of friendship, be it with Jesus, or with another human being. As for the quote from Thomas Aquinas, one important thing to have in common is the desire for connection and a mutual affirmation. Aside from that, everything else can consist of differences. Or, if you will, contrasts. The Post-Synodal Apostolic Exhortation on this link at the Vatican site.
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