How noble is the sad heart who would sing a joyous song with joyous hearts.

Ask if you can help when they look sad.

And I wrote this same unto you, lest, when I came, I should have sorrow from them of whom I ought to rejoice; having confidence in you all, that my joy is the joy of you all.

What I don't understand is why. Why am I moved when the joysand sorrows in fact are not my own - nor even real?

Whenever you start worrying, instantly shift your focus to what you can do about the problem right now. If there's nothing to do, let it go.