“I am more afraid of our own blunders than of the enemy's devices.”

“why do our enemies shape us more than our friends?”

“In the end we are all caught in devices of our own making. I believe that. In the end we are all caught.”

“Necessity when threatening is more powerful than device of man.”
Efficacior omni arte imminens necessitas.

“Religion is the most inflammatory enemy-labelling device in history.”

“He is his own best friend and takes delight in privacy whereas the man of no virtue or ability is his own worst enemy and is afraid of solitude.”

“A weapon is a device for making your enemy change his mind.”

“In my soul, therefore, I can see no one but God, since I suffer no one else to enter there, and myself less than any other, because I am my own worst enemy.”

“For man to become successful, for man to establish himself as the ruler of the planet, it was necessary for him to use his brain as something more than a device to make the daily routine of getting food and evading enemies a little more efficient. Man had to learn to control his environment.”

“The enemy is within the gates; it is with our own luxury, our own folly, our own criminality that we have to contend.”