You should not meddle with other people’s affairs, unless first of all you are infinitely wiser than they are—of course, one always thinks that one is wiser!—but I mean in an objective way and not according to your own opinion; unless you see further and better and are yourself above all passions, desires and blind reactions. You must be above all these things yourself to have the right to intervene in someone else’s life—even when he asks you to do so. And when he does not, it is simply meddling with something which is not your business.
Ref: On Thoughts and Aphorisms