It’s saying that your perception of the world is often a function of the attitude and intentions you enter it with. People who are kind and selfless often inspire or compel other people to do the same, either in return directly or in passing it forwards. People that put out that good energy often also see the benefits and are open to receiving kindness from other.

It’s not 100% foolproof obviously, and there’s still a lot about the world that’s awful, but whether you’re in the ‘there’s hope for humanity’ camp or the ‘burn it all down, humans are irredeemable’ camp often correlates to the way you treat other people yourself.