It does depend though if you can recognize a barbarian at the gate - of your own heart, as well as the barbarian  at the gate of my own heart. Guard your heart means your own...

Keep your heart with all diligence,
For out of it spring the issues of life.
Put away from you a deceitful mouth,
And put perverse lips far from you.
Let your eyes look straight ahead,
And your eyelids look right before you.
Ponder the path of your feet,
And let all your ways be established.
Do not turn to the right or the left;
Remove your foot from evil.

                                                                    ~Proverbs 4:23-27