This was said by the Buddha, the Perfected One: that is what I heard. Vuttañhetaṁ bhagavatā vuttamarahatāti me sutaṁ:

“A mendicant should meditate wakeful, mendicants, mindful and aware, joyful and clear, and at times discern the skillful qualities in that state. “Jāgaro cassa, bhikkhave, bhikkhu vihareyya sato sampajāno samāhito pamudito vippasanno ca tattha kālavipassī ca kusalesu dhammesu. A mendicant who meditates in this way can expect one of two results: Jāgarassa, bhikkhave, bhikkhuno viharato satassa sampajānassa samāhitassa pamuditassa vippasannassa tattha kālavipassino kusalesu dhammesu dvinnaṁ phalānaṁ aññataraṁ phalaṁ pāṭikaṅkhaṁ—enlightenment in this very life, or if there’s something left over, non-return.” diṭṭheva dhamme aññā, sati vā upādisese anāgāmitā”ti.

The Buddha spoke this matter. Etamatthaṁ bhagavā avoca. On this it is said: Tatthetaṁ iti vuccati:

“Listen up, wakeful ones! “Jāgarantā suṇāthetaṁ, And those asleep, wake up! ye suttā te pabujjhatha; Wakefulness is better than sleep, Suttā jāgaritaṁ seyyo, the wakeful have nothing to fear. natthi jāgarato bhayaṁ.

Those who are wakeful, mindful and aware, Yo jāgaro ca satimā sampajāno, immersed in samādhi, joyful and clear, Samāhito mudito vippasanno ca; rightly investigating the Dhamma in good time, Kālena so sammā dhammaṁ parivīmaṁsamāno, at one, would banish the darkness. Ekodibhūto vihane tamaṁ so.

That’s why you should apply yourself to wakefulness. Tasmā have jāgariyaṁ bhajetha, A keen and alert mendicant, possessing absorption, Ātāpī bhikkhu nipako jhānalābhī; having cut the fetter of birth and old age, Saṁyojanaṁ jātijarāya chetvā, would experience supreme awakening <j>in this very life.” Idheva sambodhimanuttaraṁ phuse”ti.

This too is a matter that was spoken by the Blessed One: that is what I heard. Ayampi attho vutto bhagavatā, iti me sutanti.

Dasamaṁ.