Samyutta Nikaya 1:41
SUJATOYaṁ kiñci viññāṇaṁ atītānāgatapaccuppannaṁ ajjhattaṁ vā bahiddhā vā oḷārikaṁ vā sukhumaṁ vā hīnaṁ vā paṇītaṁ vā yaṁ dūre santike vā, sabbaṁ viññāṇaṁ: ‘netaṁ mama, nesohamasmi, na meso attā’ti evametaṁ yathābhūtaṁ sammappaññāya daṭṭhabbaṁ.
You should truly see any kind of consciousness at all—past, future, or present; internal or external; solid or subtle; inferior or superior; far or near: <em>all</em> consciousness—with right understanding: ‘This is not mine, I am not this, this is not my self.’