What's with threes

Three witches labored over their cauldron in Shakespeare’s play, MACBETH.
The U.S. Flag’s flies the tri-colors: red, white and blue.
Rasputin offered his doctrine to ladies waiting in his bedroom ( sanctum) which they termed the Holy of Holies: sin, redemption, salvation.
The three kisses of Orthodox Christians at Easter symbolized: blessing, welcome, joy.
The historic Russian triumvirate was: Tzar, Church, People.
Christians of Faith clutch their triumvirate: Father, Son and Holy Spirit.
Marked for elimination by the leaders of the Russian October revolution in 1917: nobility, peasants, intellectuals.
I offer my three-fold precaution following the election of the new Messiah, President Barack Obama: hear evil, see evil, speak evil.