You have only one head and look after it for it's a marvellous thing. No machinery, no electronic computers can compare with it. It's so vast, so complex, so utterly capable, subtle and productive. It's the storehouse of experience, knowledge, memory. All thought springs from it. What it has put together is quite incredible: the mischief, the confusion, the sorrows, the wars, the corruptions, the illusions, the ideals, the pain and misery, the great cathedrals, the lovely mosques and the sacred temples. It is fantastic what it has done and what it can do. But one thing it apparently cannot do: change completely its behaviour in its relationship to another head, to another man. Neither punishment nor reward seem to change its behaviour; knowledge doesn't seem to transform its conduct. The me and the you remain. It never realizes that the me is the you, that the observer is the observed. Its love is its degeneration; its pleasure is its agony; the gods of its ideals are its destroyers. Its freedom is its own prison; it is educated to live in this prison, only making it more comfortable, more pleasurable. You have only one head, care for it, don't destroy it. It's so easy to poison it.