There are many famous sayings similar to the proverb "Birds of a feather flock together", which means that people tend to establish relationships with people similar to themselves. Here are some related quotes:

1. The association between a strong-willed person and a weak-willed person will make the former stronger and the latter weaker.

2. The interaction between the rich and the poor will make the rich richer and the poor poorer.

3. The association between a wise man and a fool will make the wise man smarter and the fool more stupid.

4. The interaction between good people and bad people will make the former more kind and the latter more evil. In a word, people's behavior and attitude are often influenced by their environment and communication objects. Some successful people will also say that if you want to succeed, you should spend more time on those successful people instead of wasting time on losers.