You wouldn't go out of your way to make a random person on the street happy

For a friend like them, you'd spend the entire year devoted to making them feel happier

Would you put off other important things in your life for a stranger's needs?

For her, you would in a heartbeat

Would you try and give your advice, even though you knew next to nothing on the topic?

For your best friend, you'd try your best and wish them well

Why do we devote all this to a friend?

......

Because a friend would do it for you