Give what you want.
A smile? Give a smile.
Friendship? Be friendly.
Want money? Give money.
Sales? Help someone sell something.
Contacts? Help someone else get contacts.
Teach and you'll learn. The more you teach those who want to learn, the more you'll learn.
I don't know where I found that exactly, or if I made it up at some point, but it's been on my mind. And tonight I'm wondering what you think about that.