In recent times, some thinkers have postulated that modern friendships have lost the force and importance that they had in antiquity. C. S. Lewis for example, in his The Four Loves, writes:
The friendship between the Romanians and Serbians from the border of the Danube is an organic friendship. Maybe the Romanians from the Mehedinti county cannot explain themselves this, but they feel more friends with the Serbians from the Danube villages and cities than with other regions from Romania. It is about centuries of common life. You can see in Drobeta Turnu Severin more frequently a Serbian from Negotin than an habitant of Bucharest or Moldavia. Here, the borders was always just a formal, not a real wall between the two areas.
Friendship is a relationship which involves mutual knowledge, esteem, and affection. Friends will welcome each other's company and exhibit loyalty towards each other, often to the point of altruism. Their tastes will usually be similar and may converge, and they will share enjoyable activities. They will also engage in mutually helping behavior, such as exchange of advice and the sharing of hardship. A friend is someone who may often demonstrate reciprocating and reflective behaviors.