Modesty and chastity are twins. [ Mrs. Jameson ]

Familiarity and satiety are twins. [ Mme. Deluzy ]

Rivalry and envy are Siamese twins. [ H. W. Shaw ]

Anticipation and Hope are born twins. [ Rousseau ]

Pride and weakness are Siamese twins. [ Lowell ]

Discretion
And hard valour are the twins of honour,
And, nursed together, make a conqueror;
Divided, but a talker. [ Beaumont and Fletcher ]

Sleep and death, two twins of winged race,
Of matchless swiftness, but of silent pace. [ Pope ]

For fate has wove the thread of life with pain,
And twins even from the birth are misery and man. [ Pope ]

But look for ruin when a coward wins; For fear and cruelty are ever twins. [ Aleyn ]

Sufficient unto the day is one baby. As long as you are in your right mind don't you ever pray for twins. Twins amount to a permanent riot. And there ain't any real difference between triplets and an insurrection. [ Mark Twain, The Babies ]