‘Venerable Nāgasena, that one quality of the sailor which you say he ought to take, which is it?’

‘Just as the sailor on board ship, O king, thinks thus: “I am a hireling, and am working for my wage on board this ship. By means of this ship is it that I get food and clothing. I must not be lazy, but zealously navigate the ship;” just so, O king, should the strenuous Bhikshu, earnest in effort, think thus: “Gaining a thorough knowledge of this body of mine, put together of the four elements, continuously and unceasingly will I be self-possessed in mindfulness and thoughtfulness, and tranquil and peaceful will exert myself to be set free from births, old age, disease, and death, grief, lamentation, sorrow, suffering, and despair.” This, O king, is the one quality of the sailor he ought to have. For it was said, O king, by Sāriputta, the Elder, the Commander of the Faith:

“Understand what the body is, realise that again and again,
Seeing the nature of the body, put an end to grief.”’