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The three characteristics of the conditioned and the unconditioned.
Saṅkhatalakkhaṇa sutta - Characteristics Of The Conditioned
"Bhikkhus, there are these three characteristics of the conditioned. What three? An arising is evident, passing away is evident, and alteration while it remains is evident. These, bhikkhus, are the three characteristics of the conditioned."
Characteristics Of The Unconditioned
"Bhikkhus, there are these three characteristics of the unconditioned. What three? No arising is evident, no passing away is evident, and no alteration while it remains is evident. These, bhikkhus, are the three characteristics of the unconditioned."