“Bitter, being first to tell you bitter news.”

“There was no time for bitterness now: eat bitterness, and bitterness eats you.”

“Everyone is a little bitter. We're born bitter. The personality itself is really just a very complex defense mechanism. A reaction to the first time someone said, "No you can't.”

“Oh darling, don't be bitter. It's the first instinct of the weak.”

“… when was a woman ever witty without being bitter?”

“Oh why rebuke you him that loves you so? / Lay breath so bitter on your bitter foe.”

“Bitterness imprisons life; love releases it. Bitterness paralyzes life; love empowers it. Bitterness sours life; love sweetens it. Bitterness sickens life; love heals it. Bitterness blinds life; love anoints its eyes.”

“They told me, Heraclitus, they told me you were dead,
They brought me bitter news to hear and bitter tears to shed.
I wept, as I remembered, how often you and I
Had tired the sun with talking and sent him down the sky.”

“Life's too short to be bitter, I'm too short to be bitter.”

“For to love, loveless, is a bitter pill:
But to be loved, unloving, bitterer still.”