I keep my friends as misers do their treasure, because, of all the things granted us by wisdom, none is greater or better than friendship.
I just do not hang around anybody that I don't want to be with. Period. For me, that's been a blessing, and I can stay positive. I hang around people who are happy, who are growing, who want to learn, who don't mind saying sorry or thank you... and [are] having a fun time.
Fate makes us family. choice makes us friends.
Be slow in choosing a friend, slower in changing.
Men of sense often learn from their enemies. It is from their foes, not their friends, that cities learn the lesson of building high walls and ships of war.