Birds Of A Feather

"There are three sorts of friendships which are advantageous, and three which are injurious. Friendships with the upright, friendships with the sincere, and friendships with the well informed are advantageous. Friendships with those who flatter, friendships with those of weak principles, and friendships with those who talk cleverly are injurious."
Confucius : Chinese philosopher

Found in Go English:"Birds of a feather flock together means that people who are similar to each other often spend time together."
[...]
"We know that birds are of the same type when they have the same feathers; they are of a feather. Birds flock when they join together in groups with other birds. Just as birds "of a feather" often flock with other birds of the same "feather", so do people who are like each other spend time together."

Picking our friends is a joy. My friends have enough in common with me to be empathetic at the right time but enough differences to make them interesting.