It means, how hollow life we are leading; where external appearance matters to all and not what is within.
Everything should point inwards.
One cease to exists, if looking validation outward.
Salvation lies within. All the heaven, hells, Gods are within us. We don't need to look anywhere else.
And we all are responsible for it, selfie maniacs click selfies because we endorse it.
Why blame only them? We all are to blame!