… an enemy within the gates, doing more harm than good.
On the BBC during World War II:
A nation can survive its fools, and even the ambitious. But it cannot survive treason from within. An enemy at the gates is less formidable, for he is known and carries his banner openly. But the traitor moves amongst those within the gate freely, his sly whispers rustling through all the alleys, heard in the very halls of government itself.
Do not forget that a traitor within our ranks, known to us, can do more harm to the enemy than a loyal man can do good to us.
A thousand enemies outside the house are better than one within. Arab proverb
Better a thousand enemies outside the house than one inside.
See Lyndon Johnson's remark about J. Edgar Hoover for a modern extrapolation.
Beware of no man more than of yourself; we carry our worst enemies within us.
O God, that men should put an enemy in their mouths to steal away their brains!" - Cassio (Act II, Scene iii)
Every man is his own chief enemy.
I think this idea of fighting the enemy within is sort of more interesting than fighting an external enemy.
Our most merciless enemy is our past.
And if the soul Is to know itself It is into a soul That it must look: The stranger and the enemy, we've seen him in the mirror.
Every man is his own worst enemy
We have met the enemy and he is us.
A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself.
The Enemy, who wears her mother's usual face and confidential tone, has access; doubtless stares into her writing case and listens on the phone.
I'm my own worst enemy.
Your worst enemy cannot harm you as much as your own unguarded thoughts.
When there is no enemy within, the enemies outside cannot hurt you.
I greatly fear some of America's greatest and most dangerous enemies are such as think themselves her best friends.
Unlike an external enemy, the inner enemy cannot regroup and launch a comeback once it has been destroyed from within.
You will find that our enemies are our own kin. It is they who betray us. So learn this most important lesson-in the end, our worst enemy is ourselves
Know that you are your greatest enemy, but also your greatest friend.
Do you want to know the man against whom you have most reason to guard yourself? Your looking-glass will give you a very fair likeness of his face.
If you want an enemy, the soul (nafs) is sufficient. If you want advice, death is sufficient.
For soon the body is discarded, Then what does it feel? A useless log of wood, it lies on the ground, Then what does it know? Your worst enemy cannot harm you As much as your own thoughts, unguarded. But once mastered, No one can help you as much, Not even your father or your mother.