Humility is the single most difficult thing for a human being to achieve, or if and when we do achieve it, maintain it for any length of time.

 If you want to test yourself, just pick out a few complete strangers, or a few acquaintances, and then just briefly jot (write) down what you think you understand that they can't possibly understand.
Jot down what you think their intelligence level is, and their natural abilities.
Jot down what you think their political views are, and their beliefs.
Jot down what you think their education level is.
Jot down what you think their basic life experiences have been up to now.

After you're finished, read over your list.
Ask yourself why you think you know these things
about people you don't know.

Most of us think very, very highly of our ability to assess other people, both those we "know", and those we don't "know".  And we don't even care about finding out whether we're right or not, we just believe whatever we tell ourselves about other people, and treat them accordingly.

We humans were born with an instinct for self-preservation, and a feeling of satisfaction from dominating objects and mastering tasks.

We were also born with an instinct to eat living things. Nothing, except for water, was not alive before we consumed it, and so we must feel that we have the right to kill what was alive in order to sustain ourselves, in order to survive. Many humans are in denial about it, but it's a fact. Humans can not live on stones, crystals, or air molecules, or on water alone. Therefore we must dominate other living things in order to live ourselves, like nearly every other creature on Earth.

We were also born as social animals who naturally live in groups to survive, just like Chimpanzees, our closest relative. Because of this, we tend to create clans and tribes.
Within these clans we tend to create hierarchies similar to Chimpanzees, even though we don't need to. Because our intellect is high enough that we can achieve the maturity to live in full cooperation with, and support of, every member.

And yet, most humans do not let their intellect lead them, but instead their neuro-chemistry which gives them little squirts of feel-good chemicals when they dominate something or someone, or when they THINK they're dominating something or someone.

We are, as a species, evolved enough to control ourselves and live intelligently, in cooperation, peace, and support.

And yet, there are so many individuals within the species who follow the trail that getting high on their own chemicals leads them, that they sabotage that goal, constantly.

Humility is the requirement for the goal of peace.

But there are too many human individuals who would rather get high on hormones and neurotransmitters than have peace.