Gates and Fences.
Build a little fence out of first impressions and gut instinct,
with a gate that opens in both directions, to help regulate your circle of friends.
Inside it, construct a brick wall to protect your emotions.
Entry is restricted and by invitation only.
Then, finally, build a fortress to contain your inner sanctum.
Complete with guards on 24 hour duty ready to forcibly remove anyone you might have,
during a momentary lapse of judgement, allowed inside.