"Ananda, I am now old, worn out, venerable, one who has traversed life’s path, I have reached the term of life, which is eighty. Just as an old cart is made to go by being held together with straps, so the Tathagata’s body is kept going by being strapped up. It is only when the Tathagata withdraws his attention from outside signs, and by the cessation of certain feelings, enters into the signless concentration of mind, that his body knows comfort."