Loka-dhammā: The eight worldly winds
Life's eight shifting conditions, which blow in opposing pairs: gain and loss, praise and blame, fame and disgrace, pleasure and pain. Prosperity and adversity are one such pair, set against each other the way wind fills a sail one hour and falls flat the next. Bend like a tree in each gust and you keep standing while both winds blow past.
Aniccā: Impermanence
Whatever arises also passes. The day of prosperity stays no longer than the day of adversity; each rolls in and out like weather crossing a field, one clear morning turning to storm and back again. Knowing the bright day is already leaving loosens your grip, and knowing the dark day is also leaving holds off despair.
Dukkha: Suffering
The ache built into things that cannot last. The day of adversity carries this ache in plain sight, and the day of prosperity hides the same one, since a good thing gripped tightly already stings with the fear of losing it. Hold your joy with an open hand, and when it slips away your hand is already open.
Yoniso manasikāra: Wise attention
Attention aimed at the root of a thing. "Consider," says the day of adversity, and here is the considering it asks for: a steady look at how the hard day arose, what holds it up, and how it too will pass. Follow the trouble back to its source the way you trace a stream to its spring, and what looked like fate shows itself as conditions that gathered and will scatter.
Upekkhā: Equanimity
The even heart that stays level whatever blows through it. Prosperity and adversity stand side by side so you can be joyful in the one without clutching and reflective in the other without sinking. Picture an old balance scale that God has loaded on both pans at once, the beam holding steady because each weight answers the other. Since no one can find out what any tomorrow holds, this steadiness, not a grip on the future, is what carries you through.