Digha Nikaya 1:953
SUJATOkatamaṁ nu kho dukkarataraṁ vā durabhisambhavataraṁ vā—
Which is harder and more challenging to do while conscious and awake:
katamaṁ nu kho dukkarataraṁ vā durabhisambhavataraṁ vā—
Which is harder and more challenging to do while conscious and awake: