This life is like a mirror, you see yourself in other people, see other people in you. It is like an echo, whatever comes out from you will come back to you.
Whatever you send, it comes back. You send a prayer of peace and luck to others, the universe will bring peace and luck to you.
What goes around comes around. You give love, you get love in return. You bring suffering to others, you will pay the price.
What you see in others also exists within yourself. You see the warmth, tolerance in others, you are the same tolerant and warm person like that.