Aesop's Fables
#219 The Oak and the Woodcutters
The Woodcutters cut down a Mountain Oak and split it in pieces, making wedges of hits own branches for dividing the trunk.
The Oak said with a sigh, "I do not care about the blows of the axe aimed at my roots, but I do grieve at being torn in pieces by those wedges made from my own branches."
MORAL: Misfortunes springing from ourselves are the hardest to bear.