Those who have no friends are poor people and you cannot expect them to be happy.
We should be able to distinguish real friends from purely business-typed ones.
You fall victim to your friends if you are not selective of them.
As the saying goes: Hanging around with honest friends, you learn to be honest; hanging around with dishonest friends, you learn to be dishonest.
A friend of mine once told me that in her eyes, friendship is more precious than marriage.
I hold that in a sense, friendship and marriage are very similar because marriage is supposed to get started from friendship and is thus the highest level of friendship but not the finishing line.