No one but myself can be blamed for my fall. I have been my own greatest enemy-the cause of my own disastrous fate.
I'm my own worst enemy sometimes when I pick projects.
Yet is every man his greatest enemy, and, as it were, his own executioner.
Yes. He is quite a good fellow - nobody's enemy but his own.
The stories I want to tell are when we're our own heroes and our own enemies, and I don't think that's a rude thing to ask for. I don't think that's something I should apologize for.
By the data to date, there is only one animal in the Galaxy dangerous to man -- man himself. So he must supply his own indispensable competition. He has no enemy to help him.
The impatient man is his own enemy; he slams the door on his own progress.
