Choni, the Maagol, once saw in his travels an old man planting a
carob-tree, and he asked him when he thought the tree would bear fruit.
"After seventy years," was the reply. "What!" said Choni, "dost thou
expect to live seventy years and eat the fruit of thy labor?" "I did not
find the world desolate when I entered it," said the old man; "and as my
fathers planted for me before I was born, so I plant for those that will
come after me."
THE TALMUD, _Taanith_, fol. 23, col. 1.