Who has never tasted what is bitter does not know what is sweet.
An angry woman is vindictive beyond measure, and hesitates at nothing in her bitterness.
—Jean Antoine Petit-Senn (1792–1870) Swiss Poet
You can surmount the obstacles in your path if you are determined, courageous and hard-working. Never be fainthearted. Be resolute, but never bitter … Permit no one to dissuade you from pursuing the goals you set for yourselves. Do not fear to pioneer, to venture down new paths of endeavor.
—Ralph Bunche (1903–71) American Political Scientist, Diplomat
From the midst of the very fountain of pleasure, something of bitterness arises to vex us in the flower of enjoyment.
—Lucretius Roman Poet, Philosopher
Strong and bitter words indicate a weak cause.
—Victor Hugo (1802–85) French Novelist
Bitterness is like cancer. It eats upon the host. But anger is like fire. It burns it all clean.
—Maya Angelou (1928–2014) American Poet