Change is not easy for many people. Over time, we develop beliefs, thoughts, attitudes and behaviors that give us a feeling of certainty in the world and make up our identity, and identity is a big thing for people. It is the skeleton that defines who we are. This makes it very hard for us to let go when it seems like we have to give up a bone from our skeleton and we are afraid we will not be able to stand properly.
People are a lot like monkeys. If you want to catch a monkey, you can put a cage with a banana in front of it. Once the monkey holds the banana, the monkey is trapped, because their hand will not come out with the banana. Monkeys are not smart enough to know that if they let go of the banana, they will be able to slide their hand out of the cage, so they stay trapped.
People hold on to beliefs, thoughts, attitudes and behaviors that trap them like bananas and are afraid to let go of them even when they rot and smell.
For most, letting go of a banana means that we will no longer be able to maintain our identity. Allowing change means that we will be crippled or handicapped. I think this is because they consider letting go as a form of giving up and since childhood, they have heard millions of times “Never, never give up!” and interpreted it as “Never let go”.