Pride is an independent, me-oriented spirit. It makes people arrogant, rude and hard to get along with. When our heart is prideful, we don't give God the credit and we mistreat people, looking down on them and thinking we deserve what we have.
All complaining comes from pride.
There's a deceptive sin that can keep us from walking in love: pride. It's deceptive because when you have pride, you're usually too proud to admit it. I know this because I used to have teachings on pride and they didn't sell well.