Other people believe that they'll be selfish if they open themselves up for Universal good. Somehow, they're afraid they're taking it from others. Many blockages to a better life stem from old feelings of guilt or not being deserving. We may not be aware of the feelings, but we get to experience the results by not accepting all that the Universe gives us. When I was little, I accepted good graciously.
Most small children do, until they get brainwashed that receiving is a no-no.
Then I drew people into my life who told me that I didn't deserve the good I had. I was told that others less fortunate should have my good, and I had to give them all of what I had. When I loaned my pristine condition comic books to friends, the comics were returned to me in shreds, if they came back at all. If I got upset at my possessions being destroyed, I was chastised that I was putting too much importance on material objects. Since I had to struggle to prove I deserved good, I even blocked the Universe from helping me.