“The political friend of today is the possible enemy of tomorrow. And vice versa. All those who work by a calculation of interest in politics must take that into account. Neither give your secrets to the friend nor give the adversary blows that cannot be forgotten.”

“Life works on strange laws of nature (Karma).
One never knows when a friend turns enemy & vice-versa.
Rely on your Self; self-reliance”

“Trust the friends of today as though they will be the enemies of tomorrow.”

“War as the most extreme political means discloses the possibility which underlies every political idea, namely, the distinction of friend and enemy.”

“Take not thine enemy for thy friend; nor thy friend for thine enemy!”

“Are you out of your mind?"
It's not polite to lie to your best friend. "It's a possibility.”

“In political activity, then, men sail a boundless and bottomless sea; there is neither harbour for shelter nor floor for anchorage, neither starting-place nor appointed destination. The enterprise is to keep afloat on an even keel; the sea is both friend and enemy; and the seamanship consists in using the resources of a traditional manner of behaviour in order to make a friend of every hostile occasion.”

“A depraved culture supports a depraved politics and vice versa.”

“Political criticism is our enemies' best friend.”

“And there comes a time when one must take a position that is neither safe, nor politic nor popular - but one must take it because it is right.”