From Monmouth College's Ravelings yearbook, 1906.  (For some unbelievably weird yearbook imagery, see our How to Hoodoo Hack a Yearbook.)

From Japan and the Japanese Illustrated by Aimé Humbert, 1874.

"Then she prayed, 'Lead, Kindly Light, amid the encircling gloom," from Thrilling Life Stories for the Masses, 1892.

An illustration from an 1884 issue of Puck magazine.  The caption reads: "His Christmas Prayer: 'Oh! — — — —!'"  This will also be of interest: The Collected Lost Meanings of Christmas.

"Why I believe in telepathy":  an illustration from a 1912 issue of Hampton's magazine.  The caption reads: "While I was praying, I saw, hovering above my head, some gold circles."

"If you must pray, then pray to your invisible self; it is the only god that answers your prayers, other gods give you stones instead of bread.  Unhappy are they who pray to an idol and their prayers are heard: they lose their own selves, since they are no longer capable of believing that it was they themselves that answered their prayers."
—Gustav Meyrink, The Green Face