Cattāri Brahmavihārā

What is the advantage of often reviewing this: ‘I am liable to get sick, I am not exempt from sickness’? There are sentient beings who, drunk on the vanity of health, do bad things by way of body, speech, and mind. Reviewing this subject often, they entirely give up the vanity of health, or at least reduce it. This is the advantage of often reviewing this: ‘I am liable to get sick, I am not exempt from sickness’.

https://suttacentral.net/an5.57/en/sujato