Trouble, trouble, boil and bubble...

• If fortune turns against you, even jelly breaks your tooth.— Persian Proverb
• You can't have more bedbugs than a blanket-full. — Spanish Proverb
• I am convinced that we have a degree of delight, and that no small one, in the real misfortunes and pains of others. — Edmund Burke
• If there were no tribulation, there would be no rest; if there were no winter, there would be no summer. — St. John Chrysostom
• Suffering is the sole origin of consciousness. — Fëdor Dostoevski
• Evey calamity is a spur and a valuable hint. — Ralph Waldo Emerson
• Know how sublime a thing it is / To suffer and be strong. — Henry Wadsworth Longfellow
• If you are distressed by anything external, the pain is not due to the thing itself, but to your own estimate of it; and this you have the power to revoke at any moment. — Marcus Aurelius
• Happiness is beneficial for the body, but it is grief that develops the powers of the mind. — Marcel Proust
• Weeping may endure for the night, but joy cometh in the morning. — Bible, Psalm 30:5

Note: our title is a reference to the witch's scene in Macbeth, Act 4, scene 1. The bard's exact words are: "Double, double toil and trouble; Fire burn, and cauldron bubble."