If I had a heart - L. Frank Baum

"Seems to me," said Cap'n Bill, as he sat beside Trot under the big acacia tree, looking out over the blue ocean, "seems to me, Trot, as how the more we know, the more we find we don't know." "I can't quite make that out, Cap'n Bill," answered the little girl in a serious voice, after a moment's thought, during which her eyes followed those of the old sailor-man across the glassy surface of the sea. "Seems to me that all we learn is jus' so much gained." "I know; it looks that way at first sight," said the sailor, nodding his head; "but those as knows the least have a habit of thinkin' they know all there is to know, while them as knows the most admits what a turr'ble big world this is. It's the knowing ones that realize one lifetime ain't long enough to git more'n a few dips o' the oars of knowledge."

...thanks for good deeds do not amount to much except to prove one's politeness.

"Suppose we try kindness," suggested the Tin Woodman. "I've heard that anyone can be conquered with kindness, no matter how ugly they may be." At