[1] Thus have I heard. On one occasion the Blessed One was dwelling among the Bhaggas at Susumāragira, in the Bhesakaḷā Grove, the Deer Park. … Then the householder Nakulapitā approached the Blessed One; having approached and paid homage to the Blessed One, he sat down to one side. Sitting to one side, the householder Nakulapitā said this to the Blessed One: "Venerable sir, I am old, aged, elderly, advanced in years, come to the last stage of life; my body is afflicted, I am constantly ailing. And, venerable sir, I do not get to see regularly the Blessed One and the bhikkhus who inspire the mind (manobhāvanīya). Let the Blessed One exhort me, venerable sir; let the Blessed One instruct me, venerable sir, in such a way as would be for my welfare and happiness for a long time."
"So it is, householder! So it is, householder! This body is afflicted, like an egg, covered over. For, householder, one who, carrying this body about, would claim even a moment's health — what would that be other than foolishness? Therefore, householder, you should train yourself thus: 'Though my body is afflicted, my mind (citta) will be unafflicted.' Thus indeed, householder, should you train yourself."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.