Calm is
Sound Realistic Reason...

Buddha
praised
this simple
contemplation for everyday progress:
Five things have been well taught by the Blessed One who knows and sees,
the Purified One, Perfectly Self-Enlightened by himself, that is, the five
subjects for daily recollection by women and men, monks and householders.
What are the five?
1: I am prone to decay, I am not yet beyond
this decay.
2: I am prone to get a disease, I am not yet beyond
this disease.
3: I am prone to die, I have not yet got beyond this certainty
of death.
4: All I hold as mine, dear and delightful, will change, crumble
and then vanish.
5: I am the owner of my kamma, born of my kamma, created
and conditioned
by my kamma, inheritor of my kamma, related and joined to my kamma, my
life
now is supported by my prior kamma (=behaviour). Whatever
kamma I will do,
whether good or evil, only I will come
to experience the later resulting effects!
Anguttara Nikāya V, 57


More on contemplation
and recollection (Anussati):
Buddha_Contemplation,
Dhamma_Contemplation,
Sangha_Contemplation,
Generosity_Contemplation,
Divinity_Contemplation,
Death_Contemplation,
Body_Contemplation,
The_7_Contemplations,
Successful_Reviewing.

Source: BPS
Wheel no 54 (Edited
Excerpt):
The Mirror of the Dhamma. A Manual of
Buddhist
Devotional Texts.
By Nārada Thera and Bhikkhu Kassapa. Revised By Bhikkhu Khantipālo:
https://What-Buddha-Said.net/library/Wheels/wh_054.pdf