A big step of spiritual maturity for me many years ago was realizing not everybody thinks, and feels, and believes like I do. We tend to, by nature, think if I feel, or think, or believe a certain way, so does everybody else, or should be expected to like me. Hardly true.
It's quite liberating to realize it's just not that way. You live in peace when you accept this truth. And even more so when you realize the different things that other people think, and feel, and believe in, and to what extent, may be right, and YOU yourself may be wrong. That's how a person sleeps well at night and lives in peace.
It's also the key to learning. We all have to consider that other people may be right and we are the one that is wrong. If you want to be smart, you have to have that attitude.